HiFlow Exhaust Manifold Crosspipe 02-05/08+ WRX, ALL STi/LGT

( 2 Reviews )

Current stock: 0

It appears that you’re not the only one with excellent taste in premium automotive components! Unfortunately, both the un-coated and coated crosspipes are temporarily out of stock, however should become available soon. You can still place your order and be put in a queue; the item will be shipped ASAP. Please contact our customer service via email or phone (612-379-0000) with questions, or check for availability with our retailers, thanks!

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


2 Reviews

B Harch 10th Apr 2023

Great quality parts!

Part was shipped almost instantly and arrived well packaged. The gaskets and mounting hardware included made install a breeze especially since the old parts were rusty and crusty! This part went on with ease and I couldn't be happier with the product! Would highly recommend Grimmspeed parts. The ceramic coating will make this part last forever! Will be buying more parts in the future. This compliments my grimmspeed up pipe and down pipe perfectly (along with ebcs, heat shield, cold air intake, intercooler, alternator cover, all the things brah! Just buy yourself one or some already!

Kosta 7th Mar 2017

2016 UK WRX STi - it fits!

Dropped the guys a note and they offered free return shipping if it didn't fit my UK 2016 WRX STi, excellent service IMO. So I took a punt on this fitting as I'd figured all EJ exhaust manifolds have been the same for however long! I've always ported my stock manifold pieces as I just prefer the sound of the originals vs stainless. So anyway it turns up, and what a quality piece of exhaust! Very well made GrimmSpeed! I was very impressed. I opted not to have the heat coated version as I always go for exhaust wrap, feels like a shame to have wrapped it and hide the quality ! It fits perfectly, supplied with the gaskets and nuts/bolts, all high quality also. Anyway mapping day is coming up, very much looking forward to seeing the results. I'll be sure to share my dyno results. Thanks guys, I won't hesitate to order from you again. Regards Kosta

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