GN1 Performance KB Headers – Modified for Xona Rotor Turbo & 50mm Turbosmart Wastegate

All of the hardwork has been completed. The turbo will mount in the perfect location. All youve got to do is setup vbands for the cross over pipe and get a dumptube for the wastegate.

🔧 These used GN1 Performance KB Headers have been modified to accept a Xona Rotor turbo or any turbo with a 1.05 a/r Tial stainless exhaust housing and a 50mm Turbosmart wastegate. The setup is nearly complete—just needs the crossover pipe finished, dump tube setup, and recoating for a clean finish.

🔥 Custom GN1 Performance KB Headers – Built for Serious Boost! 🔥

Upgrade your 1986-1987 Buick Grand National or Turbo Regal with these modified GN1 Performance KB headers, designed for high-horsepower applications. These headers have been converted for modern turbo setups, allowing you to run a Xona Rotor turbo or any turbo with a Tial stainless exhaust housing. They’re also set up for a 50mm Turbosmart wastegate, making this an ideal upgrade for serious performance builds.

✅ GN1 Performance KB Headers – Known for high-flow design & durability
✅ Modified to Accept Xona Rotor Turbo – Or any turbo with a stainless exhaust housing
✅ Designed for 50mm Turbosmart Wastegate – Optimized for boost control
✅ High-Flow Exhaust Setup – Improves spool time & top-end power
✅ Almost Complete! – Just needs crossover pipe, dump tube, and recoating for a clean finish

🔧 Perfect for someone looking to finish this custom setup and bolt it onto a high-performance Turbo Buick build!

🟡 Yellow Dot – Solid Parts at Serious Discounts!

🔹 These were likely working when removed, but we don’t bench-test them beforehand.

🔹 Ideal for builders & restorers who know their way around Turbo Buicks.

🔹 Save 70%–80% off retail—high-value parts at a fraction of the cost!

The Fine Print All Sales Final: No take-backs, refunds, or exchanges. 

As-Is Condition: We inspect every part before it hits the listing, but we recommend you double-check compatibility with your project. 

Your Acknowledgment: By purchasing from Turbo 6 Parts, you agree to these terms.