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?

dont bother as you will gain nothing out of doing it and you might get a leak, but if you were to change out to equal length headers you might pick up a few HP

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Funny looking German Subaru

Thanks Dave...that is what the tuning shop told me too, but then on the websites they all say "easiest horsepower gains" which was tempting. Done I wil stay away then as the STI Up Pipe is good enough ;-)

Thought about equal length headers but then my mate told me that I would lose my Subaru rumble (dak dak noise) so decided not to for now...I wonder is that is true.

yes you will lose the dak dak if you go equal length headers
best bang for buck on a pig sti is just a good flash tune imo

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Funny looking German Subaru

Ok then....might just stick to my TBE + Deatchwerks fuel pump + verso for now...then much later on look at some upgraded unequal length header plus up pipe.

Thanks Dave...I've seen some horror stories on iwsti about up pipes cracking and was really weary about it...now I know its not worth the trouble.

You're also meant to do porting along with the new up-pipe otherwise it's not worth the money/effort with just uppipe only

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I recon go a 3-port boost control solenoid. They are only 100buks but will improve the car so much when it is tuned.

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The one perkent...

ok...but the Grimmspeed one is the only up pipe that comes already ported...Grimmspeed started out as a porting company... that's why I think its said to be the best on the international forums(iwsti/naisoc)...along with the Perrin one, but thats not ported..

Did you mean porting the up pipe only or the whole thing like headers etc?

3 port boost control solenoid...been seeing mixed reviews on the forum about these.

Some say that the STi automatic control of the boost is good enough? Whats the point of controlling it? don't you just want max boost all the time - which is what the oem control does.
I have no idea what it would do adding this manual control in - going by what I've seen in other threads

yeah i mean header porting as well