Changing the exhaust
#1
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Changing the exhaust
I have decided it is time to make my 2003 WRX a bit louder – not the most original post I know. Right now it is completely standard other than a Prodrive back box but I want a little more of that burble in the cabin without needing to remap the car or replace the Prodrive back box as I like the look of it. I have been searching the forums for a while and realise that I have come down to 3 options. So, my questions are:
Cheers in advance for your advice, it’s much appreciated.
Ed
- Will the Prodrive centre section (including the resonator) be louder than the standard WRX centre section and resonator? If so, enough to notice it?
- Should I instead get a straight through centre section i.e. no resonator? Will I need to remap the car after this?
- In addition to my decision on the centre section I could get the second cat removed using the Prodrive second decat pipe. I understand this will still pass an MOT but will I need to remap the car after this?
Cheers in advance for your advice, it’s much appreciated.
Ed
#3
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My advice if you like the factory system but want it to be MOT friendly is:
1. Bin the WRX up pipe and replace with a Harvey up pipe to aid spool.
Not only does this strangle performance but the cat in the pipe also has the potential to break up and go through your turbo destroying it as it gets older and more fragile.
2. Replace your existing down pipe and centre section with a Prodrive sports cat and decat centre section, these can be had fairly cheap second hand.
Should be a little louder and make more power (but yes you'll need a map to take full advantage).
My old bug WRX made 281 on a TD04 with that setup after a map, but you'll definitely notice the difference.
1. Bin the WRX up pipe and replace with a Harvey up pipe to aid spool.
Not only does this strangle performance but the cat in the pipe also has the potential to break up and go through your turbo destroying it as it gets older and more fragile.
2. Replace your existing down pipe and centre section with a Prodrive sports cat and decat centre section, these can be had fairly cheap second hand.
Should be a little louder and make more power (but yes you'll need a map to take full advantage).
My old bug WRX made 281 on a TD04 with that setup after a map, but you'll definitely notice the difference.
Last edited by MrNoisy; 06 January 2015 at 04:34 PM.
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#5
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My advice if you like the factory system but want it to be MOT friendly is:
1. Bin the WRX up pipe and replace with a Harvey up pipe to aid spool.
Not only does this strangle performance but the cat in the pipe also has the potential to break up and go through your turbo destroying it as it gets older and more fragile.
2. Replace your existing down pipe and centre section with a Prodrive sports cat and decat centre section, these can be had fairly cheap second hand.
Should be a little louder and make more power (but yes you'll need a map to take full advantage).
My old bug WRX made 281 on a TD04 with that setup after a map, but you'll definitely notice the difference.
1. Bin the WRX up pipe and replace with a Harvey up pipe to aid spool.
Not only does this strangle performance but the cat in the pipe also has the potential to break up and go through your turbo destroying it as it gets older and more fragile.
2. Replace your existing down pipe and centre section with a Prodrive sports cat and decat centre section, these can be had fairly cheap second hand.
Should be a little louder and make more power (but yes you'll need a map to take full advantage).
My old bug WRX made 281 on a TD04 with that setup after a map, but you'll definitely notice the difference.
Having said that, in a month or so I may completely change my mind - remove a couple of cats and get a map done!
#6
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Exactly the 'conversation' I'm having with myself for my Classic.
Fitted a H&S back box on it but would like a little more burble so having looked at the options, I think a de resonated centre is the next step as doing the downpipe/de cat puts me into remap territory and I'm not wanting to go there just yet.
Yet
Fitted a H&S back box on it but would like a little more burble so having looked at the options, I think a de resonated centre is the next step as doing the downpipe/de cat puts me into remap territory and I'm not wanting to go there just yet.
Yet
#7
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On my V3 STi I have standard headers, full 3" system to include an Apexi sports cat and a Cobra de resonated mid section and back box with 3.5" tail pipe, sounds awesome! Other than this mod I only run an HKS panel filter. The car is run on Momentum 99 with octane booster and it runs spot on, no need for remap.
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