MAPerformance Fabrication

MAP Comp-Gate40 External Wastegate O2 Housing | 2003-2006 Mitsubishi Evo 8/9 (EVO-O2H-CG40-EXT-3D)

  • Sale
  • $377.99
  • Regular price $415.99

Evo 8/9 O2 Housing

In yet another installment of our never-ending quest for the perfect Evo O2 Housing we have utilized the new, ultra-compact CompGate40 from Turbosmart. If you're having issues with boost control and/or exhaust back pressure is overpowering the spring in your wastegate actuator preventing you from running higher boost levels this product is the answer! We recommend running this external wastegate in conjunction with your factory internal wastegate for the best of both worlds in regards to spool characteristics, boost control and boost capabilities.

Simply run a vacuum line to the external wastegate from your boost controller as normal combined with an additional vacuum line directly from a boost source to the internal wastegate actuator and you're all set, no additional modification necessary!

Features / Benefits

  • Made from 304 stainless steel for superior corrosion resistance and enhanced appearance.
  • CompGate40 14PSI wastegate for improved boost control and higher boost capabilities.
  • Fits all Evolution 8 & 9
  • Includes all necessary gaskets and hardware. (Some stock hardware is reused)
  • 100% Made in the USA.


We offer this product with a 3D contoured option to ensure you have complete boost control.

Ceramic Coating: Our advanced ceramic coating option helps control heat soak. The piece is coated in a thermal barrier (available in black only) that looks great and protect wires and hoses from heat. Please note the coating may need some extra "curing" to prevent flaking after installation. Please allow the part to heat up during normal driving or idling and then completely cool before putting it through it's paces.

Please note that this product is built to order. Based on fluctuations in demand build times may vary throughout the year. Please contact an MAP sales representative for current estimations.


  • 2003-2006 Mitsubishi Evo 8/9

What's In The Box?

  • 1 External Wastegate O2 Housing


  • MAP Limited Lifetime Warranty