I've recently installed my GrimmSpeed HiFlow Exhaust Manifold Crossover pipe and it's a definate improvement over the stock piece and compliments my ported OEM manifold setup very nicely. I didn't realize how the flex was constructed till I looked at it up close, well besides something in there rattleing you can see it necks down, ALOT. I was even able to put the heatshielding back on the Grimm pipe! So it's coated and shielded! I don't have any horsepower figures as my car is in serious need of a tune, but just driving around town feels much smoother on acceleration, just looking at the two pieces it's obvious it will flow more. The ceramic coating feels nice too I'm hoping to get the car tuned soon, I'm positive this piece will show improvements!

Thanks GrimmSpeed!!!



GrimmSpeed HiFlow Exhaust Manifold Crossover vs. OEM:




more info here:
GrimmSpeed :: Subaru Racing Parts

 

I can take a hint...


Looks nice.

 

haha

 

hey man you ought to add your review up to Subaru Review Engine Part Reviews

found that a few years ago, not sure how many people know about it. i figure the more people know about it, the more accurate the info is going to be

 

Im waiting to get mine for my ported header. i was going to get the injen but they want to much

 

I know it's like double the price of the grimm...