Wastegate

SPA Turbo 35mm Wastegate - $65

SPA Turbo “S” inlet flange

The wastegate is mounted between the exhaust ports on the cylinder head and the inlet port on the turbocharger. If the exhaust pressure in the manifold exceeds the desired amount of boost, the wastegate opens and allows the exhaust to bypass the turbocharger.

After literally days of researching, the brand SPA Turbo was identified as a solid company that does their own R&D and manufacturing in Brazil. A SPA Turbo compact 35mm stainless steel wastegate was purchased off eBay for $65US.

Boost control built into the top of the wastegate

The only real downside to the part is the proprietary 3-bolt “S” flange. You can buy individual “S” flanges separately and use it to make a custom mounting plate or pipe.