Exhaust options for my hatch STi
16 October 2018, 08:12 PM
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Exhaust options for my hatch STi
OK, I am after a bit more noise but want to keep my Prodrive backbox, what options do I have for mid pipe and cat? I don't want to decat BTW.
16 October 2018, 10:41 PM
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Do you have a second decat? You can remove that and central resonated pipe and will add some noise.
17 October 2018, 08:29 AM
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Good question Jay, as far as I understand it the prodrive exhaust on a 330s is only the backbox so the standard STi diagram should be accurate and it looks like I can remove. I am assuming the standard size is 2.5 inch?
17 October 2018, 09:56 AM
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correct on 330s 2nd cat is already removed. you can still remove the centre silencer/resonator that will help the noise a bit on it. CharlySkunkweed on here done it.
this is his car
17 October 2018, 10:47 AM
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Thanks for that Gambit, definitely sounds a bit better, do you happen to know what he replaced it with?
17 October 2018, 03:20 PM
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Scorpion do a 2nd decat pipe. Had one on mine before going decat. Does make a difference in noise but that was on a cat back system.
17 October 2018, 03:44 PM
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Thanks mate, H&S have one as well so will check it out, I assume remap won't be required until the cat is changed or I go for a bigger system?
17 October 2018, 04:01 PM
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I didn't have mine remapped for the 2nd decat. Not advising you to do the same mind,it was my own choice although I didn't have any issues after doing so.
17 October 2018, 04:31 PM
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@Rusti. with it being a 330s you already
do not have a second cat!
you have a cat in Downpipe, a 2nd decat pipe, a centre section including resonator and a back box.
its the resonator highlighted in the centre section you want to remove and the easiest way is to get it cut out and replaced with a straight section
Last edited by Gambit; 18 October 2018 at 09:47 AM .
17 October 2018, 07:20 PM
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Yeah i just got a custom exhaust fitter to cut out the resonater and weld a straight peice in its place. Dead cheap and easy.
17 October 2018, 09:15 PM
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Thanks all, that looks like a plan, need to find someone on the south coast who can do it, time for Google
18 October 2018, 10:08 AM
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Seen a few straight through centre pipes on eBay. But cutting and welding sounds best way.
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