GrimmSpeed HiFlow Exhaust Manifold Crosspipe - WRX 2006-2007 / Forester XT 2004-2008
What's one of the most overlooked anti-flowing OEM Subaru pieces you ask?? The stock exhaust manifold crossover. 50% of your exhaust gases are passing through this tiny pipe. GrimmSpeed's Version 2 Subaru Exhaust Manifold HiFlow Crossover is the solution to this problem. They've decided to step it up a notch with the first revision of their crossover. Immaculate welds, smooth as butter 2" stainless steel, and thick 12mm stainless flanges. You can't beat this piece.
Customers have seen up to a 15 HP increase when combined with a PnP Subaru Exhaust Manifold. This unit is built from 1.92" 304 Stainless Steel throughout, maximizing exhaust flow from cylinders 1 and 4 to the manifold collector for faster turbo response. This unit has a flex point in the center to allow for easier installation and for thermal expansion during hard driving.
Add on GrimmSpeed's Ceramic Heat Coating to help keep the heat in and speed up those exhaust gases even more.
This includes all the gaskets necessary for installation.
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