bagpipes

I am looking to take one of the cats off of my MY05 sti ppp, which would be the best one to change?

The 1 on the down pipe or the 1 on the front pipe?

Who is best to get the replacement pipe from?

thanks

bagpipes

bagpipes

Just found out that my sti has only got a sports cat on the down pipe as it is fitted with the ppp which is standard for a car with the ppp I believe.

scooby,dlm.

yes,only 1,if its a ppp set up the pipe has a cowling round it!!!it looks like a cat but its just a striaght throu pipe,nice!!

funkyspider

In that case you wont gain much by replacing the Prodrive sports cat with a decat downpipe. Mike from Prodrive has posted on the subject and from memory there's about 2bhp in it ?

If the reason for removing it was more power then an Ecutek Remap will give that with what already have - Might be worth adding a K&N or Green replacement Panel filter

bagpipes

Thanks
What benefit would there be in replacing the back box or from the down pipe back, would it just result in the car being louder

scooby,dlm.

the turbo wud spool up a quicker,as the guy above says ecutek remap and maybe a cold air induction kit,should ad a few more bhp

pippyrips

my jdm sti is pushing 368/368 with tek 3 map, full milltek exhaust system and RCM induction kit

bagpipes

Don’t want to go down the road of a remap as I still have 1½ years of warranty.

Am I right in believing that you are better just to change the panel filter as you don’t get any benefit from putting on a induction kit unless you are up over 350bhp?

What would be the difference in changing the exhaust from the sports cat on the down pipe back?

Alan MaC

Bagpipes, a K&N Sports Panel Filter is good, the Induction ones can be a lot of trouble.

Good Luck.

Alan MaC

scooby,dlm.

i was talking to kev down at scoobyclinic,he says that u can put aftermarket performace parts on,ie exhausts etc but a ppp ecu wont recognise the bits u put on!!may sound better and get a tiny bit more power but thats it!!

mr_p1ssed_off

Including your thread title you mention UP-PIPE, DOWN-PIPE and FRONT-PIPE so havent a clue which pipe you want to change

Don't know about your model year, but on my '02 WRX there was an UP-PIPE cat which was BEFORE the turbo, then a DOWN-PIPE cat which was after the Turbo and finally a cat in the centre section (not to be confused with the resonator section) and I've removed all 3!

It now starts boosting around 1500rpm and is on FULL boost between 2000-2500 rpm which makes it far more driveable

Mr PO

GazTheHat

If not mapped, possibly, otherwise OK.

bagpipes

Thanks lads,

Mr po,

I confused myself with that one, I meant the front cat (which I don’t have as I have ppp) and the down pipe (which is fitted with the ppp sports cat) I think.