These headers are produced by TA Performance with research and development by ArizonaGN and are based upon a proven, unique design that has been used successfully for over six years. It is a high-quality unit, made by a leading manufacturer who has produced many types of headers and has been in the industry for years. The pipes have been specially designed and made to optimize flow with large radius bends and smooth transition joints to enhance Turbo Buicks. This custom design also aids flow at high RPM’s.
There are 3 versions of the stainless steel TA headers, one is a stock replacement which have design and production changes for better flow and reliability. The performance version is a refined design for optimum flow and velocity for higher HP builds. This set uses band clamps on the crossover connections to provide a more positive seal. The performance set is also available for 4-bolt turbos. The flanges on all TA headers are laser cut to fit either 8-bolt or 14-bolt heads.
Installation has been made simple and easy, each bolt can be easily accessed. The header pipes do not hinder spark plug access. Access to re-torquing headbolts or studs is available with slight modifications to the gasket.
On a GN with factory A/C, a 3-1/2″ THDP can easily be used with no modifications required to car or pipe.
Crossover pipe is 2 pieces with a unique, leak proof slip joint [pat. pending].
The slip joint allows adjustment for differences in type of heads and engine machining. The crossover will clear block girdles and mini-starters. The crossover to header flanges are CNC machined and both tapered for a very tight fit. The pipe/header joint has an overlap fit into the header. A gasket can be used if desired.
These headers will be sold as a complete kit, Header flange gaskets and a turbo flange gasket will be included. All hardware, clamps and stud kits will be part of the package.
The 4-bolt is offered only in stainless steel and includes a waste-gate stub pipe welded in before the turbo flange.