Doctor S Posted March 27, 2012 Share Posted March 27, 2012 Hello everyone and greetings from Portugal. Please excuse some errors on my writing, since English it’s not my native tongue. After reading several threads about different combos, and having to resist the urge to buy the more proven exhaust, I’ve gone for a custom exhaust, and since I've never seen this configuration i though sharing with you. I’m trying to get a silent system without drone or rasp that allows for long trips. This is the first part of the job Decat Y-pipe with two resonators. 2.5’’ to 3.’’ Videos with the stock mipipe and muffler. I was not completely happy with the sound so a few weeks later the second part of the "job" was underway. My camera was repairing, so unfortunately i don't have photos of the fabrication and the assembly. But the midpipe and the backbox are similar to the milltek system as you can "guess" from the video This is the final product, some warm revs: I was aiming for a free flow exhaust as silent as possible. 2.5'' pipes from the headers to 3'' connection, then 3'' all the way. The car as 4, yes 4 silencers (2 in the Y-pipe, 1 in the midpipe(as big as possible LOL) and a OEM sized final silencer , so it's is very mild in volume and no rasp, despite being decatted. Currently it is as loud as the stock exhaust with test pipes. It gurgles at lot more. No drone at constant speed (a big bonus), and a nice and deep tone. The only thing that i think it could be better is the resonance at 2500-3000 rpm. My best guess is that this is byproduct of the removal of the cats and probably being generated from the Y-pipe, do you think that adding heat wrap to this section would diminish this? The butt dyno approves, the car seems is much more responsive overall Quote Link to comment Share on other sites More sharing options...
DoogyRev Posted March 27, 2012 Share Posted March 27, 2012 Good Work and it sounds great Welcome Along BTW Quote Link to comment Share on other sites More sharing options...
MITZ@CougarStore Posted March 27, 2012 Share Posted March 27, 2012 Looks very tidy... Quote Link to comment Share on other sites More sharing options...
manphibian Posted March 27, 2012 Share Posted March 27, 2012 Great first post, and perfect English Welcome Looks to be a very well made exhaust! Definitely without the Cats, it will resonate a lot more. Not sure heat wrap would make much difference, maybe if you wrapped loads of it on there? Quote Link to comment Share on other sites More sharing options...
Wasso Posted March 27, 2012 Share Posted March 27, 2012 Surely all those silencers are going to be restrictive?? Gota say, for all those out there who want more noise, it's rather contrasting to see someone step the other way. Hats off to you for that. Good write up too... Quote Link to comment Share on other sites More sharing options...
Zugara Posted March 27, 2012 Share Posted March 27, 2012 Quote Link to comment Share on other sites More sharing options...
Doctor S Posted March 27, 2012 Author Share Posted March 27, 2012 Thanks a lot guys. Definitely without the Cats, it will resonate a lot more. Not sure heat wrap would make much difference, maybe if you wrapped loads of it on there? I think i will give it a try, nothing to lose i guess. Surely all those silencers are going to be restrictive?? Gota say, for all those out there who want more noise, it's rather contrasting to see someone step the other way. Hats off to you for that. Good write up too... First 3 (LOL), are pretty much free flow, the inner diameter doesn't change. I guess the back box may restrict a bit i guess (but less than the stock), it's the price for a "silent" exhaust. If my Z was a weekend car i would have surely gone for a more noisy system. But for a daily use and 500 miles voyages I've gone for this. I've not yet dynoed the car but im expecting some gains, i think overall is a very good compromise performance/sound. Quote Link to comment Share on other sites More sharing options...
Doctor S Posted March 29, 2012 Author Share Posted March 29, 2012 My Zed went to get an alignment. I took the oportunity to get the missing photos. Quote Link to comment Share on other sites More sharing options...
Bry Posted March 31, 2012 Share Posted March 31, 2012 Holy crap the underside of that car is clean Quote Link to comment Share on other sites More sharing options...
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