got my 3" downpipe fitted today !! wow, what a difference !!
17 March 2007, 05:57 PM
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got my 3" downpipe fitted today !! wow, what a difference !!
i noticed a much quicker response and spooled up 500rpm earler and was much more lively !! the front wheels spun in 2nd and 3rd (slightly wet !) but generally much better than before.. peaked at 1.18kgfm and fealt a whole lot smoother boosting too ! a top upgrade !! didnt realise the std sti downpipe was strangling the engine so much with that cat in it ! 
thanks to john at elite exhausts in ayr !
thanks to john at elite exhausts in ayr !
17 March 2007, 08:14 PM
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I'll just say that if this is a UK STi id get it remapped, engines aint cheap, acutally if its any new age STi id get it remapped as all the engines will have a problem with a decat, wrx's are ok, JDM classics..... wouldnt risk it on a v5/6 without a remap either.
As for strangling, yes the cat does, a sports cat like a PPP one doesnt, it will flow as much though as the decat will but you wont fail your roadside emissions tests
Tony
As for strangling, yes the cat does, a sports cat like a PPP one doesnt, it will flow as much though as the decat will but you wont fail your roadside emissions tests
Tony
17 March 2007, 09:07 PM
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Is that true Tony ? I've only got the Prodrive sports cat on my STi and was considering De catting it as it's just passed it's MOT and would give me 12 months before i had to worry about replacing it for the next one.
If there would be little differnce then i might well re consider
If there would be little differnce then i might well re consider
17 March 2007, 09:24 PM
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sorry guys forgot to add, its a 555 ver 2 sti ! simply the best looking car on the planet !
in my bias opinion !!
here she is in all her glory ! (ayrshire in the sun)
in my bias opinion !!
here she is in all her glory ! (ayrshire in the sun)
18 March 2007, 12:28 PM
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Is that true Tony ? I've only got the Prodrive sports cat on my STi and was considering De catting it as it's just passed it's MOT and would give me 12 months before i had to worry about replacing it for the next one.
If there would be little differnce then i might well re consider
If there would be little differnce then i might well re consider
Tony
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18 March 2007, 02:06 PM
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ive got a brand new ppp down pipe to be fitted to my sti before it goes for a remap and looking at the size of the cells i cant see how this can cause a restriction as each cell is about the size of a bic pen.
18 March 2007, 04:20 PM
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Mike Wood from Prodrive went into this subject a little deeper but the sports cat flows as much gas as a decat if not more due to the size of the cat, even though there are cores in there, so replacing the sports cat with a decat pipe gives no benefit except the hassle of needing a remap and the cost of the pipe and fitting.
Tony
Tony
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