3" Down Pipe with a 46mm Wastegate and Boost controller Combo This is a GN1Performance "3 INCH 46mm EXTERNAL WASTEGATE DOWN PIPE and BOOST CONTROLLER COMBO " for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This 3" Inch... MSRP: Was: Now: $649.00 Choose Options
3" Down Pipe with a Flat Flange no Wastegate This is a GN1Performance "3 INCH FLAT FLANGE DOWN PIPE WITH " for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This 3" Inch Down Pipe with a Flat Flange and... MSRP: Was: Now: $399.00 Choose Options
3" Down Pipe with a V-Band 46mm External Wastegate This is a GN1Performance "3 INCH 46mm EXTERNAL WASTEGATE DOWN PIPE" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This 3" Inch External Wastegate Down Pipe is constructed out of 304 stainless... MSRP: Was: Now: $585.00 Choose Options
3" Down Pipe with Internal Wastegate This is a GN1Performance "3 INCH INTERNAL WASTEGATE DOWN PIPE " for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This 3" Inch Internal Wastegate Downpipe is designed to work with... MSRP: Was: Now: $489.00 Choose Options
3.5" Down Pipe with a V-Band 46mm External Wastegate This is a GN1Performance "3.5 INCH EXTERNAL WASTEGATE DOWN PIPE WITH A 46mm WASTEGATE" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6.This is our all new 3.5" Inch External wastegate downpipe... MSRP: Was: Now: $650.00 Choose Options
3.5" Down pipe with Flat Flange This is a GN1Performance "3.5 INCH INCH FLAT FLANGE DOWN PIPE" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 literb turbo V6. This is our all new 3.5" Inch Flat Flange Downpipe constructed out of 304 stainless steel... MSRP: Was: Now: $399.00 Choose Options
3.5" Down pipe with V-Band flange This is a GN1Performance "3.5 INCH V-BAND DOWN PIPE" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This is our all new 3.5" Inch V-Band Flange Downpipe constructed out of 304 stainless steel. All tig... MSRP: Was: Now: $399.00 Choose Options
4 INCH V BAND AND CLAMP This is a "V-BAND AND CLAMP COMBO" kit comes with a stainless steel v band ring and a heavy duty t clamp. This is a great item for those who would like to build their own custom down pipes. MSRP: Was: Now: $45.00 Add to Cart
Boost Controller This is a Boost Controller which is good for up to 50psi. It comes complete with all the hardware, fittings, and mounting brackets necessary. MSRP: Was: Now: $99.00 Add to Cart
Porting Exhaust Housing This is a picture to show how much your exhaust port should be ported when going with an aftermarket external down pipe. MSRP: Was: Now: $0.00
