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No more Blow Off Valve Leaks!

GrimmSpeed Mitsubishi EVO Master Cylinder Brake Brace
  • 3x Thicker Than OEM Gasket

  • Rubber forms to bad mating surfaces

  • Metal interal layer to prevent blow-outs



We all know how bad the OEM Subaru Top Mount Intercooler Gaskets are. They are the greatest source of leaks in the entire intake stream. Fear not, GrimmSpeed has answered your call! We present to you the 3x thicker GrimmSpeed TMIC BOV Gasket. Not only is this gasket 3 times thicker, it also contains an inner metal layer that will help prevent blow outs. The TMIC surface and the BOV flange never seem to truly mate to each other. That's where the 3x thicker BOV Gasket's extra thickness comes in handy, creating a better seal for better protection against leaks.


The reinvention of heavy duty, it's what you can expect from GrimmSpeed™


4 Reviews

James 3rd Sep 2019

Needed new gasket when swapping Sti intercooler

Great product. Great company. Fast shipping. Gasket fit perfect! Thicker than stock, no issues with it sealing at all.

RV 1st Sep 2019

Better than OEM

Matting surface may have uneven spots so little prepping is done to flattened the BOV/intercooler surface. Thicker than OEM and little soft. No leak or any problems. Great product!

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