This is a set of GN1Performance "KB 4 HEADERS with 46mm Wastegate, Blow Off Tube, and Boost Controller Combo" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. Included in this kit is a custom welded passenger side header with a wastegate provision fabricated in it, a billet 46mm wastegate, a custom blow off tube (blowing into the atmosphere) and a boost controller. They feature HUGE ports and are welded all the way around each tube! These headers are only available in none polished raw stainless finish. They are complete with gaskets, clamps, and cross pipe. This set is for the customers who are running a 4 bolt turbo.
*These are for competition use only modifications or adjustments maybe required. Header Application Down pipe is needed!