HiFlow Exhaust Manifold Crosspipe - Subaru 02-05 WRX, 08-14 WRX, 04-20 STI, 05-09 LGT




Collections: Exhaust, Headers & Manifolds

Product type: HiFlow Exhaust Manifold Crosspipe

Vendor: GrimmSpeed

Tags: 02, 04, 05, 08, 09, 14, 20, 2002 wrx, 2003 wrx, 2004 sti, 2004 wrx, 2005 legacy, 2005 sti, 2005 wrx, 2006 legacy, 2006 sti, 2007 legacy, 2007 sti, 2008 legacy, 2008 sti, 2008 wrx, 2009 legacy, 2009 sti, 2009 wrx, 2010 sti, 2010 wrx, 2011 sti, 2011 wrx, 2012 sti, 2012 wrx, 2013 sti, 2013 wrx, 2014 sti, 2014 wrx, 2015 sti, 2016 sti, 2017 sti, 2018 sti, 2019 sti, crosspipe, exhaust, hiflow, lgt, manifold, sti, subaru, wrx



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

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. Do not worry though, GrimmSpeed has a solution for you!


The GrimmSpeed Subaru HiFlow Crosspipe is made of 304 Stainless Steel (flanges, flex, tubing) and has a pipe-wall thickness of 14 Gauge, this is the most "heavy-duty" pipe you will find in the aftermarket. 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.
Add on our amazing Ceramic Heat Coating for a small fee to help keep the heat in and speed up those exhaust gasses even more.

  • Boost transition is improved over stock
  • Helps airflow in the mid to high rpm range.


    • '02-'05 and '08-'14 WRX
    • '04-'19 STi
    • '05-'09 LGT