Performance Exhaust Header

Your factory exhaust manifold is restricting both your 1988 GMC S15 sound and power. By upgrading to Performance Exhaust Headers, your making it easier for your engine to push exhaust gasses out of the manifold. With your performance exhaust manifold, each cylinder will get its own exhaust pipe, rather than sharing a common manifold. This will help you gain more horsepower and torque. Another added benefit to headers is you will increase the sound you crave.

Depending on your vehicle, and your intended use there are different headers you can go with. We carry a large inventory from leading manufacturers, which will include both short tube headers and long tube headers. Long tube headers like the name states, are much longer than short tube headers. They merge further out which results in even less backpressure. Long tube headers are ideal for high-rev vehicles, and racing. They build most power in the mid to high RPM range. These headers can also be difficult to install, or require some more work due to needing more space for the long tubes. Alternatively short tube headers merge in a shorter distance and are ideal for low-RPM power. For daily drivers and towing, these will build power the most power from idle to mid range. If you have any questions about what headers are best for you reach out to one of our experienced representatives and we will help you make a more informative decision.
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HEDMAN 69490
Please Note:

Some images might not represent the actual product

HEDMAN 69490 Exhaust Header
for 1988 GMC S15 BASE

$582.42

Save: $75.97
Sale Price:

$506.45

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 8 New In Stock
EngineFit NotesFitment Notes
1988 GMC S15 BASE equipped with
L
 
Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: No
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Bolts/Studs Included:Yes
Flange Thickness:0.25 in.
Gasket Or Seal Included:Yes
Reducers Included:Yes
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Collector Size:3 in.
Collector Style:BALL and SOCKET Style (Gasketless)
Exhaust System Dia:2-1/2 in.
Finish:Uncoated
Finish Type:Uncoated Mild steel
Flange Style:Standard
Replacement Head Flange Gasket:27500
Header Port Shape:Round
Manual Transmission
Column:No
Manual Transmission
Floor:No
Material:Mild Steel
Oil F
 
1988 GMC S15 BASE equipped with
L Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: No
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Bolts/Studs Included:Yes
Flange Thickness:0.25 in.
Gasket Or Seal Included:Yes
Reducers Included:Yes
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Collector Size:3 in.
Collector Style:BALL and SOCKET Style (Gasketless)
Exhaust System Dia:2-1/2 in.
Finish:Uncoated
Finish Type:Uncoated Mild steel
Flange Style:Standard
Replacement Head Flange Gasket:27500
Header Port Shape:Round
Manual Transmission
Column:No
Manual Transmission
Floor:No
Material:Mild Steel
Oil F
,
HEDMAN 69050
Please Note:

Some images might not represent the actual product

HEDMAN 69050 Exhaust Header
for 1988 GMC S15 BASE

$473.26

Save: $61.73
Sale Price:

$411.53

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 10 New In Stock
EngineFit NotesFitment Notes
1988 GMC S15 BASE equipped with
L
 
Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Engine Family: SB CHEVY Gen III/IV (LS engines)
Engine:Chevy LS Series
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Bolts/Studs Included:Yes
Catalytic Converter(s) Included:No
Collector Attachment:3 in.
Collector Bolts Included:Yes
Tube Style:Long Tubes
Collector Style:Ball and Socket Style (Gasketless)
Contents:Headers, gaskets, 3-bolt exhaust adapters, mounting hardware
Crossover Pipe Included:No
Cylinder Head:Stock Profile Heads
Cylinder Head Port Shape:Round
E
 
1988 GMC S15 BASE equipped with
L Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Engine Family: SB CHEVY Gen III/IV (LS engines)
Engine:Chevy LS Series
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Bolts/Studs Included:Yes
Catalytic Converter(s) Included:No
Collector Attachment:3 in.
Collector Bolts Included:Yes
Tube Style:Long Tubes
Collector Style:Ball and Socket Style (Gasketless)
Contents:Headers, gaskets, 3-bolt exhaust adapters, mounting hardware
Crossover Pipe Included:No
Cylinder Head:Stock Profile Heads
Cylinder Head Port Shape:Round
E
,
HEDMAN 69040
Please Note:

Some images might not represent the actual product

HEDMAN 69040 Exhaust Header
for 1988 GMC S15 BASE

$402.76

Save: $52.53
Sale Price:

$350.23

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 1 New In Stock
EngineFit NotesFitment Notes
1988 GMC S15 BASE equipped with
L
 
Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: No
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Engine Family: SB CHEVY Gen III/IV (LS engines)
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Bolts/Studs Included:Yes
Catalytic Converter(s) Included:No
Collector Attachment:2-1/2 in.
Collector Bolts Included:Yes
Collector Size:2-1/2 in.
Collector Style:Ball and Socket Style (Gasketless)
Contents:Headers, gaskets, 3-bolt exhaust adapters, mounting hardware
Crossover Pipe Included:No
Cylinder Head:Stock Profile Heads
Cylinder Head Port Shape:Round
Emissions Notes:NOT
 
1988 GMC S15 BASE equipped with
L Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: No
Auto Transmission
Floor: Yes
Manual Transmission
Column: No
Manual Transmission
Floor: No
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Engine Family: SB CHEVY Gen III/IV (LS engines)
Air Conditioning:Yes
Automatic Transmission
Column:No
Automatic Transmission
Floor:Yes
Bolts/Studs Included:Yes
Catalytic Converter(s) Included:No
Collector Attachment:2-1/2 in.
Collector Bolts Included:Yes
Collector Size:2-1/2 in.
Collector Style:Ball and Socket Style (Gasketless)
Contents:Headers, gaskets, 3-bolt exhaust adapters, mounting hardware
Crossover Pipe Included:No
Cylinder Head:Stock Profile Heads
Cylinder Head Port Shape:Round
Emissions Notes:NOT
,
HEDMAN 69400
Please Note:

Some images might not represent the actual product

HEDMAN 69400 Exhaust Header
for 1988 GMC S15 BASE

$349.85

Save: $45.63
Sale Price:

$304.22

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 8 New In Stock
EngineFit NotesFitment Notes
1988 GMC S15 BASE equipped with
L
 
Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: Yes
Auto Transmission
Floor: No
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Footnotes: (6) Modification to stock exhaust required to retain catalytic converter.
Footnotes: (1) Without smog injection or injection heads.
Footnotes: (132) Hydraulic clutch only.
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Drive type: RWD
 
1988 GMC S15 BASE equipped with
L Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: Yes
Auto Transmission
Floor: No
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Footnotes: (6) Modification to stock exhaust required to retain catalytic converter.
Footnotes: (1) Without smog injection or injection heads.
Footnotes: (132) Hydraulic clutch only.
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Drive type: RWD
,
HEDMAN 69410
Please Note:

Some images might not represent the actual product

HEDMAN 69410 Exhaust Header
for 1988 GMC S15 BASE

$346.22

Save: $45.16
Sale Price:

$301.06

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 5 New In Stock
EngineFit NotesFitment Notes
1988 GMC S15 BASE equipped with
4.3L V6 Naturally Aspirated
 
Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: Yes
Auto Transmission
Floor: No
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Footnotes: (225) Designed for use with a Trans-Dapt throttle body spacer.
Footnotes: (45) Not legal for sale or use in California on pollution controlled motor vehicles.
Footnotes: (6) Modification to stock exhaust required to retain catalytic converter.
Footnotes: (CO) Chevrolet Only
Footnotes: (1) Without smog injection or injection heads.
Drivetrain: 4WD
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Fuel Type: GAS
 
1988 GMC S15 BASE equipped with
4.3L V6 Naturally Aspirated Air Conditioning: Yes
Power Steering: Yes
Auto Transmission
Column: Yes
Auto Transmission
Floor: No
Manual Transmission
Column: No
Manual Transmission
Floor: Yes
Footnotes: (225) Designed for use with a Trans-Dapt throttle body spacer.
Footnotes: (45) Not legal for sale or use in California on pollution controlled motor vehicles.
Footnotes: (6) Modification to stock exhaust required to retain catalytic converter.
Footnotes: (CO) Chevrolet Only
Footnotes: (1) Without smog injection or injection heads.
Drivetrain: 4WD
Emissions Notes: RACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
Fuel Type: GAS