Cat replacement pipe on STI PPP my54
 

A friend purchased an STI MY54 with a PPP kit on it. He is considering replacing the PPP cat with a replacement pipe. Does this have any positive effect on BHP or response (or noise?!)? Is there any any negatives, such as the car overboosting and requiring adustment? Any advice from peoples experiences is most welcome.

Many thanks

Steven RW

Pleeeease, can I have his PPP cat to put on my WRX? :norty:

k2iss,

Chances are he will need to keep it to pass his MOT, so giving it away wont be an option.

Steven

I tried :notworthy

I dont think your WRX would run correctly with it on, had one on my sti and when i went to do some hefty overtaking in 3rd or 4th the ecu backed everything off. Getting it remapped to sort that out.

Mike Wood says there is no performance advantage to swapping it for a decat.

But if Prodrive did do one then Mike would say that there would be an improvement if you changed ;)

Hi matey didnt you think to ask me now im one of the sheep!!!!
Cheers Rob

Steven

Positives:-
More noise

Negatives:-
More noise
More money
May need recalibrating properly to keep it safe
Dubious legality with respect to emissions
No warranty

If it did make any improvement in power output and was legal, we would do it. Unforunately it doesn't make an improvement compared to our PPP downpipe (although it would do compared to the std downpipe & cat, this is why people assume that decatting improves the performance) and is, in our opinion, illegal as it would fail an emissions test.

Mike

Rob,

Hey up! I never thought to ask you. Sorry chap!

I was meaning to ask if you recommended that power engineering re-map you had. Did you have the PPP first then try the re-map? If your car is still running the re-map after being seriously driven at god knows how many track days then it must be a reliable setup!. Do you rate it?

Mike Wood,

Thanks for the advice Mike. I'll pass the message on.

Cheers

Steven RW

If you see the latest version of the Prodrive downpipe you'll understand why it flows so well and there is no remarkable difference with decated downpipes:

http://www.rallysportdirect.com/shop...vedownpipe.jpg

open neck + splitter + wide cat input/output etc
JIM

By the way I have no connection with Prodrive in case someone believes the opposite...

wish those cat pipes were available to buy seperately :(

they are if you know where to look :)

Say USA market (for example www.rallysportdirect.com)!
Or you know something we don't know? Come on...I have e-mail :)