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 constructed out of 304 stainless steel. It comes complete with a brand new 46mm wastegate, bolts, and gaskets. All tig welds and is built to clear headers. Please keep in mind that when ordering any external wastegate down pipe a boost controller is need to allow it to function properly and avoid any damage.

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

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 liter turbo V6. This is our all new 3.5" Inch Flate Flange Downpipe constructed out of 304 stainless steel. All tig welds and is built to clear headers. 

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

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 welds and is built to clear headers.  

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

This is a GN1Performance "3 INCH 38mm 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 steel and comes with a 38mm custom wastegate. All tig welds and is built to clear headers. Please keep in mind that when ordering any external wastegate down pipe a boost controller is need to allow it to function properly and avoid any damage.        

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

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 steel and comes with a 46mm custom wastegate. All tig welds and is built to clear headers. Please keep in mind that when ordering any external wastegate down pipe a boost controller is need to allow it to function properly and avoid any damage. 

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

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 External Wastegate Down Pipe is constructed out of 304 stainless steel and comes with a 46mm custom wastegate. All tig welds and is built to clear headers. The boost controller comes complete with all the hardware needed to install it.

• Note-This pipe is also available with an 02 bung, please state if needed when purchasing.
• This item will not work on a lowered vehicle due to contact with the upper control arm.

This is a "GN1Performance Downpipe, Boost controller, and Turbo Combo" This kit includes a 3" Down Pipe with a 46mm Wastegate, a Tubonetics Boost controller, and a custom 66 turbo featuring a .63A/R exhaust, 4" inlet and a p trim wheel.

• Free test pipe with the purchase of this combo!
• The downpipe in this combo wil not work on a lowered vehicle due to contact with the upper control arm.