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Is it worth deleting second cat in mid pipe? Opinions please
Posted: Wed Feb 05, 2014 12:38 am
by scoobydoo94turbo
Hey guys I need your opinion, I have a 94 legacy turbo wagon with ej22t, engine is stock although I do have mbc running at 10psi... I currently have an STI muffler on her and im looking for a bit more noise..
During a duty c replacement I noticed my second cat in the mid pipe was somewhat collapsed or caved in, for $25 I can purchase a pipe spreader and a piece of pipe to put in place, I have access to a welder at work so that's no problem!
I believe this will allow me to get the sound I want and might actually gain me a tiny bit of performance depending on how plugged or caved in the second cat is.. Correct?
Opinions would be much appreciated!
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 1:12 am
by rallyak
I can confirm that removing second cat definitely makes it louder and more free flowing.
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 5:47 am
by James614
If the cat is caved in at all, its a good idea to remove it anyway. And I too can confirm that removing a cat adds a bit sound of sound.
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 5:28 pm
by macipusy
I thought that the unit in the midpipe was as resonator and not a cat. I was under the impression the cat is only in the DP....I cannot verify for 100% since I do not have a stock exhaust hanging out.
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 5:34 pm
by James614
Its been a while, but when I took my stock system off I was pretty sire it was two cats and a muffler no resonator.
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 6:55 pm
by SiCkSTi04
See the link below regarding how many cats our cars have
How many catalytic converters do we have?
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Wed Feb 05, 2014 7:46 pm
by scoobydoo94turbo
We have 2 cats, one directly a few inches after turbo and the second cat is in the mid pipe what ever you wana call it, i can confirm there are 2 cats, i scrapped both from my last leggy turbo.. Thanks for the info guys, ill chop it off tonight!
Cheers thanks for the replys!
Re: Is it worth deleting second cat in mid pipe? Opinions pl
Posted: Thu Feb 20, 2014 4:58 am
by scoobydoo94turbo
Just to summarize, I am very happy with my set up now, stock exhaust setup but I have cut out second cat and im running an 04 sti muffler, sounds great! Not to loud not to quiet, very nice rumble and all was done for under $100, aprox 3 hrs labour, $50 for muffler and $10 for a piece of pipe, $25 for pipe expander and a couple hours of welding and cutting..