Hi guys...

I'm just wondering if anyone here is using the Grimmspeed Up pipe on their Wrx or STis?

I was going to buy one to put on my Subaru when I get my invidia exhaust done, but have been reading mixed reviews from the american sites about changing up pipes etc.

Apparently the Invidia up pipe cracks after a while, but the Grimmspeed one is meant to be really good (Ceramic coated and all).
Would like to know if anyone is using one and if it's holding up well and also if it makes a big difference to put an aftermarket up pipe?
I know the STis have a catless OEM up pipe anyway whereas the Wrxs have a cat in there (would make a huge difference on a wrx)...but the grimmspeed up pipe is meant to have better flow that the STI one even and add ~20Hp

Any comments?