Yea I have a 2.5" custom exhaust with a supercat 2.5" (internal) resonator and a supercat 2.25" (internal) muffler. It's loud, probably twice as loud as a J's racing exhaust so it's definitely not for everyone. It also has a really aggressive exhaust note which some will love and others will hate. The car literally screams at high rpm and feels a bit stronger on the butt dyno then when I had the J's racing.Originally Posted by Suntzu
I think our stock exhaust is 57mm. ( about 2.25 inch). Id love to try a 2.5 single custom system but theres a few people here ( Junyu I think) who tried this and got a lot of noise and resonance and I cant stand that. Im totally happy witht he amount of noise my car generates for the power at the moment. So I would do it but dunno if i can take any rice droning.
That being said, the 06-08TSX went to a 62.5mm exhaust and that was after a small power increase of about 7kw I think.
So it must be worth it as 62mm is about 2.5 inch.
My last dyno was 118kw and normal euros were about 102kw ( on that dyno) so im up about 15kw, plus my latest mods Im guessing around 125kwatw now easy.
So gieven honda upped the exhaust for 7kw, i may be hitting the limit for the 57mm exhaust.
Hard to say...
A couple of larger, good quality resonators would take the volume down without impacting the flow too seriously, if at all. So it's definitely possible to have a custom exhaust that sounds good with no rice droning - you just have to find an exhaust shop that knows what they're talking about, sells good quality mufflers like supercat/magnaflow and knows how to design a system that will meet your sound level requirements.
From the dynos I've seen in the states most highly modified k-series are running 3" exhausts. But they're putting out in excess of 230whp which is the equivalent of about 200-210whp (147/150wkw) on an Australian dyno.
With the J's racing I was putting out about 124kw, a stock euro with only k&N panel filter put out about 111kw on the same day on the same dyno. So the ecu flash has definitely added a fair whack of power to your car if your putting out 15-16kw more than a standard car. Based on that, and what you've said, a 2.5" exhaust definitely wouldn't hurt with your setup. I'm just not sure how much more flow you'd get out a dual system if you decide to go that way.
Once I get my car tuned I'm hoping the true benift of my maxim works header and 2.5" single outlet exhaust is exposed. The difference between components (header, exhuast, intake etc.) is much harder to judge untill they've been tuned. Since your car has already been flashed, you should notice an improvement straight away from the less restrictive exhaust.
That's good advice. It's also part of the reason I went with a single outlet setup. The high-end off the shelf jap exhausts like Fujitsubo have well designed splits but when you go custom it can be a different story... it adds complexity, more welding and more possibility for the exhaust shop to stuff up.
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