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GMC S15 Headers

We have 3 Items In-stock. Select a year to continue.
$218.81 List Price $527.14 Save $308.33 Availability: In Stock
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PAINTED HEDDER, EXHAUST HEADER -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; Tube Size 1.5 in., Collector Size 2.5 in., Without Smog Injection Or Injection Heads, Modification To Stock Exhaust Required To Retain Catalytic Converter, With Hydraulic Clutch Only
  • SKU#: H5669400
  • Brand: Hedman
  • Fit Note: RWD, For Hydraulic Clutch Only
  • Color/Finish: Black
  • Emissions: 49-state legal - no CA shipments
  • Product Fit: Direct fit
  • Quantity Sold: Kit
  • Anticipated Ship Out Time: 2-3 business days
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Fits the following GMC S15 Years:
  • 1988-1990 | 6 Cyl 4.3L | Base, High Sierra, Sierra Classic
  • 1988 | 6 Cyl 4.3L | Gypsy
$193.96 List Price $228.87 Save $34.91 Availability: In Stock
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FLOWTECH I STANDARD FULL-LENGTH HEADERS, STEEL, BLACK, SET OF 2 -- For off road use - Not legal for use on public roads and highways; 1.5 in. tube diameter, 16-gauge tube wall thickness, 2.5 in. weld-on collector, standard head flange; All mounting hardware such as bolts, nuts, and premium gasket are included; 4-1 design; Round head port; These headers are precision-engineered and leak-tested to provide the maximum performance and fuel efficiency of your engine; Formed from specially selected 0.049 cold roll flash controlled tubing with high quality electrostatically-applied satin black paint finish; They feature Flowtech's exclusive, thick, and mandrel-formed power plenum collector; All ports are precisely fitted and finished with sturdy and leaf-proof o-ringed port seals; Must modify stock exhaust to retain catalytic converter; Application with oxygen sensor use reducer part number 10105; Heap pipe lubrication required; Will not fit angle plug heads; Requires Flowtech front frame mount for installation.
  • SKU#: F3111502
  • Brand: Flowtech
  • Fit Note: RWD, Without A.I.R. Tubes, For Engine 283-400 Swap, Without A.I.R. Tubes, For Engine 283-400 Swap
  • Emissions: 49-state legal - no CA shipments
  • Product Fit: Minor Modifications
  • Quantity Sold: Kit
  • Anticipated Ship Out Time: Same day - 1 business day
 
Fits the following GMC S15 Years:
  • 1983-1990 | All Engines | Base, High Sierra, Sierra Classic
  • 1986-1988 | All Engines | Gypsy
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$221.04 List Price $532.86 Save $311.82 Availability: In Stock
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HEDMAN STANDARD DUTY FULL-LENGTH HEADERS, STEEL, BLACK, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.5 in. tube diameter, 18-gauge tube wall thickness, 2.5 in. flange collector, 0.25 in. standard head flange; Premium gasket and installation hardware included; 3-1 design; Round head port; They feature 18-gauge mandrel-bent primary tubes; Protected by factory applied black paint for pre-installation protection; Made in the USA; Requires Elite replacement gasket part number 27670.
  • SKU#: H5669410
  • Brand: Hedman
  • Fit Note: 4WD
  • Color/Finish: Black
  • Emissions: 49-state legal - no CA shipments
  • Product Fit: Direct fit
  • Quantity Sold: Kit
  • Anticipated Ship Out Time: 2-3 business days
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Fits the following GMC S15 Years:
  • 1988-1990 | 6 Cyl 4.3L | Base, High Sierra, Sierra Classic
  • 1988 | 6 Cyl 4.3L | Gypsy
Rating: (see review/s)

"the product turned out great. sounds amazing and i enjoyed the mild power gains all the way through the rpm range. the installation was rediculous though. it took my three weeks to install, which is while going to work and school full time. i had to remove my whole front assembly minuts wp and ac. cut my ps bracket. pound my firewall in notch my frame lift my engine out a bit and alot more. these were honestly the hardest headers to install and i have installed a few. the took alot of fabing aswell. alot of work but now they are done and im glad i did it now. i would recommend these to someone with alot of time and patience. i also have 40 series flow masters, rpm air gap intake and a k&n filter ao im not sure how they sound by themselves on a truck but good luck to whoever installs these headers ur going to need it lol" posted by: Trevor on June 24, 2010

Select more GMC S15 parts under Headers, Manifolds & Components from list below.