Exhaust Universal Mufflers

Universal mufflers are created for use on a number of different vehicles so they'll need to be modified before they fit snugly onto your 2003 GMC Sierra 2500 HD's make and model. ... This means that universal fit mufflers could require professional installation.

Universal mufflers work fine on average cars but you have to find one that matches your inlet and outlet of your existing muffler. It also has to match in length and diameter. Then you have to cut off the old muffler and leave enough pipe in front of it so you can attach the new one.

A smaller muffler is going to give you a much louder sound than you would normally get with a larger muffler. The larger or longer the muffler, the less sound you will get. The smaller or shorter the muffler, the more sound you will get.Most popular mufflers do not restrict exhaust flow dramatically – and that includes chambered mufflers that are often wrongly accused of inhibiting exhaust flow and decreasing potential horsepower.

You can take your car to a muffler shop for a replacement, but installing a new muffler yourself is fairly easily and cost-efficient. To complete your muffler installation, you'll need a jack to lift up your car, a wrench, different sized ratchets, lubricant, and possibly a hacksaw.

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MAGNAFLOW 14162
Please Note:

Some images might not represent the actual product

MAGNAFLOW 14162 Universal Race Series Muffler Incl Acoustical Packing
for 2003 GMC Sierra 2500 HD ALL

$227.77

Save: $29.71
Sale Price:

$198.06

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 2 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Standard Cab Pickup 2-Door
,
MAGNAFLOW 18114
Please Note:

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MAGNAFLOW 18114 Universal Glass Pack Muffler
for 2003 GMC Sierra 2500 HD ALL

$66.25

Save: $8.64
Sale Price:

$57.61

Estimated Ship Date: Today

In Stock - 20 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Bed Length = 96.0, N/ACutting May Be Required
Extended Cab Pickup 4-Door
,
MAGNAFLOW 12229
Please Note:

Some images might not represent the actual product

MAGNAFLOW 12229 Universal Straight Through Muffler Incl Acoustical Packing
for 2003 GMC Sierra 2500 HD ALL

$149.50

Save: $19.50
Sale Price:

$130.00

Estimated Ship Date: Today

In Stock - 2 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Standard Cab Pickup 2-Door
,
FLOWMASTER 953048
Please Note:

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FLOWMASTER 953048 Super 40 Muffler Aggressive Sound
for 2003 GMC Sierra 2500 HD ALL

$154.04

Save: $20.09
Sale Price:

$133.95

Estimated Ship Date: Today

In Stock - 4 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8
 
Exhaust Muffler
3.0 in. Offset Inlet/Opposite Side Offset Outlet
Case Dimensions 5 in. x 10 in. x 13.5 in.
19.5 in. Overall Length
Aluminized Steel
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Exhaust Muffler
3.0 in. Offset Inlet/Opposite Side Offset Outlet
Case Dimensions 5 in. x 10 in. x 13.5 in.
19.5 in. Overall Length
Aluminized Steel
,
MAGNAFLOW 12770
Please Note:

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MAGNAFLOW 12770 Universal Straight Through Muffler Incl Acoustical Packing
for 2003 GMC Sierra 2500 HD ALL

$177.10

Save: $23.10
Sale Price:

$154.00

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 2 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Diesel OHV Turbo Standard Cab Pickup 2-Door
,
FLOWMASTER 53058
Please Note:

Some images might not represent the actual product

FLOWMASTER 53058 Super 50 Muffler Mild Sound
for 2003 GMC Sierra 2500 HD ALL

$212.69

Save: $27.74
Sale Price:

$184.95

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 4 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8
 
Exhaust Muffler
3.0 in. Offset Inlet/Opposite Side Offset Outlet
Case Dimensions 5 in. x 10 in. x 17 in.
23 in. Overall Length
Aluminized Steel
Not Direct Fit-Some Adaptation Required
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Exhaust Muffler
3.0 in. Offset Inlet/Opposite Side Offset Outlet
Case Dimensions 5 in. x 10 in. x 17 in.
23 in. Overall Length
Aluminized Steel
Not Direct Fit-Some Adaptation Required
,
FLOWMASTER 853558
Please Note:

Some images might not represent the actual product

FLOWMASTER 853558 50 H.D. Muffler Moderate Sound
for 2003 GMC Sierra 2500 HD ALL

$311.58

Save: $40.64
Sale Price:

$270.94

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 9 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8,
6.0L V8
 
Exhaust Muffler
3.5 in. Offset In
3.5 in. Offset Out
409 Stainless Steel
Moderate Sound
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8,
6.0L V8 Exhaust Muffler
3.5 in. Offset In
3.5 in. Offset Out
409 Stainless Steel
Moderate Sound
,
MAGNAFLOW 12468
Please Note:

Some images might not represent the actual product

MAGNAFLOW 12468 Universal Straight Through Muffler X-Pipe
for 2003 GMC Sierra 2500 HD ALL

$192.05

Save: $25.05
Sale Price:

$167.00

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 6 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Standard Cab Pickup 2-Door
,
MAGNAFLOW 14468
Please Note:

Some images might not represent the actual product

MAGNAFLOW 14468 Universal Straight Through Muffler X-Pipe
for 2003 GMC Sierra 2500 HD ALL

$308.72

Save: $40.27
Sale Price:

$268.45

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 20 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Standard Cab Pickup 2-Door
,
FLOWMASTER 953558
Please Note:

Some images might not represent the actual product

FLOWMASTER 953558 50 H.D. Muffler Moderate Sound
for 2003 GMC Sierra 2500 HD ALL

$282.84

Save: $36.89
Sale Price:

$245.95

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 13 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8
 
Exhaust Muffler
3.5 in. Offset Inlet/Offset Outlet
Case Dimensions 5 in. x 10 in. x 18 in.
24 in. Overall Length
Aluminized Steel
 
2003 GMC Sierra 2500 HD ALL equipped with
6.6L V8 Exhaust Muffler
3.5 in. Offset Inlet/Offset Outlet
Case Dimensions 5 in. x 10 in. x 18 in.
24 in. Overall Length
Aluminized Steel
,
MBRP M2050
Please Note:

Some images might not represent the actual product

MBRP M2050 Performance Muffler Installer Series
for 2003 GMC Sierra 2500 HD ALL

$218.49

Save: $28.50
Sale Price:

$189.99

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 4 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV 6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV 6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV 6.6L LB7 LLY LBZ LMN
Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
6.6L LB7 LLY LBZ LMN
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV 6.6L LB7 LLY LBZ LMN
Standard Cab Pickup 2-Door
,
Banks Power 53800
Please Note:

Some images might not represent the actual product

Banks 53800 Muffler, Stainless Steel
for 2003 GMC Sierra 2500 HD ALL

$366.85

Save: $47.85
Sale Price:

$319.00

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 4 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
6.0L V8 Gas OHV,
6.0L V8 CNG OHV Standard Cab Pickup 2-Door
,
FLOWMASTER 530513
Please Note:

Some images might not represent the actual product

FLOWMASTER 530513 50 Big Block Muffler Mild Sound
for 2003 GMC Sierra 2500 HD ALL

$318.49

Save: $41.54
Sale Price:

$276.95

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 8 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8,
6.0L V8
 
Exhaust Muffler
3.0 in. Dual Inlet/3.5 in. Offset Outlet
Case Dimensions 5 in. x 12 in. x 22 in.
28 in. Overall Length
Aluminized Steel
Not Direct Fit-Some Adaptation Required
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8,
6.0L V8 Exhaust Muffler
3.0 in. Dual Inlet/3.5 in. Offset Outlet
Case Dimensions 5 in. x 12 in. x 22 in.
28 in. Overall Length
Aluminized Steel
Not Direct Fit-Some Adaptation Required
,
MAGNAFLOW 12594
Please Note:

Some images might not represent the actual product

MAGNAFLOW 12594 Universal Straight Through Muffler Y-Collector
for 2003 GMC Sierra 2500 HD ALL

$286.90

Save: $37.42
Sale Price:

$249.48

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 6 New In Stock
EngineFit NotesFitment Notes
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Crew Cab Pickup 4-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Crew Cab Pickup 4-Door
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV
 
Standard Cab Pickup 2-Door
 
2003 GMC Sierra 2500 HD ALL equipped with
8.1L V8 Gas OHV,
6.0L V8 Gas OHV Standard Cab Pickup 2-Door