Up for sale is a classic ATR-Style 3-Inch Stainless/Aluminized External Wastegate Downpipe, complete with an authentic Turbonetics Evolution Mechanical Wastegate. This is a highly sought-after, period-correct performance upgrade designed specifically for intercooled 1986–1987 Buick Grand National, T-Type, and Turbo Regal 3.8L V6 models. [1]Key Features:
- True 3-Inch Mandrel Bends: Maximum flow capacity compared to restrictive stock pipes, significantly reducing turbo lag and exhaust backpressure. [1]
- Turbonetics Evolution Wastegate Included: Features the legendary Turbonetics Evolution 38mm external wastegate mounted directly to the pipe flange for reliable, precise high-boost control. [1, 2]
- External Gate Advantage: Dumps or routes exhaust gases cleanly away from the main turbine housing, eliminating the boost creep issues common with old stock internal puck setups. [1, 2]
- Enthusiast Pedigree: Modeled after the classic, heavy-duty ATR architecture that defined the golden era of Grand National street and strip tuning. [1]
Condition Notes:
This assembly is in solid, functional pre-owned condition. The piping shows normal cosmetic oxidation, light surface scuffs, and minor smudges typical of a vintage, used under-hood component. The Turbonetics wastegate base exhibits standard engine heat discoloration but the top cap is structurally sound. The valve mechanism moves as intended, and there are no structural cracks or severe dents anywhere along the primary 3" tube. Please carefully inspect the listing pictures to review the exact cosmetic state.Dimensions & Fitment:
- Diameter: True 3" outer diameter piping
- Application: Direct fitment layout for '86–'87 Buick 3.8L Turbo configurations
- Wastegate Specs: Turbonetics Evolution mechanical unit with standard indexing base
We package our automotive parts meticulously to ensure they reach your doorstep in exactly the condition shown. This item will securely ship out within 3 business days of cleared payment. Let me know if you need any specific flange photos
