Exahust system clarification
29 April 2008, 12:20 PM
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Exahust system clarification
Have tried searching but getting conflicting info on the exhaust setup for a 2003 WRX STi with PPP.
As far as i understand it my car will have the PPP Sports Cat downpipe, resonated PPP centre section and PPP back box? along with the PPP ECU remap.
Now if thats true ive also read that there is a 2nd cat on the up-pipe? which if there is, i assume goes from the downpipe to the turbo?
But i have also read that the STi doesnt have this second cat
The idea being that to limit the low down lag, you get a up-pipe de-cat, non-resonated centre pipe and a remap.
Is this the case? or does it only have the 1 cat in the downpipe which is removed with the PPP sports cat?
Not only this but if it does have the 2nd cat, and i replace it leaving only the ppp sports one, will it fail on MOT?!?
As far as i understand it my car will have the PPP Sports Cat downpipe, resonated PPP centre section and PPP back box? along with the PPP ECU remap.
Now if thats true ive also read that there is a 2nd cat on the up-pipe? which if there is, i assume goes from the downpipe to the turbo?
But i have also read that the STi doesnt have this second cat The idea being that to limit the low down lag, you get a up-pipe de-cat, non-resonated centre pipe and a remap.
Is this the case? or does it only have the 1 cat in the downpipe which is removed with the PPP sports cat?
Not only this but if it does have the 2nd cat, and i replace it leaving only the ppp sports one, will it fail on MOT?!?
29 April 2008, 12:30 PM
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Subaru Impreza Exhaust decat downpipe, centre section, sports cat. :
I was working from this diagram as a guide
So the 2nd cat is in the "cat pipe" which is replaced with PPP. Does this mean the 1st cat is in the downpipe then?
29 April 2008, 12:49 PM
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Just wondering has anyone else replace the std downpipe with a sports cat on a PPP car - does it pass MOT?
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29 April 2008, 10:05 PM
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Just to clarify - The PPP downpipe has a sports cat. There is little or no point in changing this.
JohnD
Last edited by JohnD; 29 April 2008 at 10:07 PM.
30 April 2008, 08:48 AM
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As from what i can gather the system has two, 1 in the downpipe and 1 in the cat-pipe after the downpipe
30 April 2008, 12:16 PM
#10
2nd cat section.
resonated section.
backbox.
The STi PPP system consists of: Downpipe with sports cat.
cat replacement section.
original resonated section.
Backbox.
So, the original system had 2 cats. The PPP has one (sports) cat.
JohnD
30 April 2008, 02:28 PM
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The original system consists of: Downpipe with cat.
2nd cat section.
resonated section.
backbox.
The STi PPP system consists of: Downpipe with sports cat.
cat replacement section.
original resonated section.
Backbox.
So, the original system had 2 cats. The PPP has one (sports) cat.
JohnD
2nd cat section.
resonated section.
backbox.
The STi PPP system consists of: Downpipe with sports cat.
cat replacement section.
original resonated section.
Backbox.
So, the original system had 2 cats. The PPP has one (sports) cat.
JohnD
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