HiFlow Exhaust Manifold Crosspipe 06-07 WRX, 04-07 FXT

SKU: 002001
( 3 Reviews )

Current stock: 0

1/2"+ Thick Flanges, 14 Gauge Tubing, TRIPLE Layer Flex Joint. We are DURABILITY.

Up until now all of you 06-07 WRX guys have been unable to swap in a higher flowing exhaust manifold crosspipe because Subaru decided to change up the design in those years. Well today is your day, we have created an 06-07 WRX specific HiFlow Crosspipe!!

Subaru supplies its turbo owners with a tiny little crosspipe from the factory. 50% of your exhaust gasses are passing through this tiny pipe and, well, that's just a problem.

The GrimmSpeed HiFlow Crosspipe is made of 304 SS(flanges, flex, tubing) and has a pipe-wall thickness of 14 Gauge, this is the most "heavy-duty" pipe you will find. Many other pipes use cheap thin steel and are marketed as "super light weight", not us. The one of a kind Triple Layer Flex Joint is not located in the bend, which adds to the life expectancy of the flex section. This unit is built from 1.92" 304 Stainless Steel tubing, maximizing exhaust flow from cylinders 1 and 4 to the manifold collector for faster turbo response. 
Customers tend to see a 5-8 HP INCREASE when running this pipe.  

Add on our Ceramic Heat Coating and help keep the heat in and speed up those exhaust gasses even more.  

  • Boost transition is improved over stockGrimmSpeed Subaru Exhaust Manifold HiFlow Crosspipe WRX FXT
  • Helps airflow in the mid to high rpm range.


  • '06-'07 WRX
  • '04-'07 FXT


3 Reviews

michael 8th Aug 2017

Best quality, period.

Nevermind the fact that GS is literally the ONLY company that makes a high flow replacement for the stock manifold crosspipe; this thing is made to Grimmspeeds usual ridiculously high standard of quality. The flanges are pure artwork and the welds are uniform yet beautiful. The added touch of the GS logo welded on a piece that you will never see after installation just highlights the teams dedication to their craft. I can't thank Justin and the team over at GS enough for being a company I can trust 100% I pretty much just want to install everything you guys make for my 2006 WRX! I can't get enough Grimmspeed in my life!

Ben Gantz 5th Jul 2017


Easy mod for quicker spool times. Thanks GS

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