Just got my exhaust system installed from the header back (all RRM) bought a CAT from them but skipped it and WOW is it an annoying sound.

Will the high flow cat help the sound? How much of the power i just gained will be lost?

Should i turn around and by a bigger resonator?

Would a different muffler solve it?

I already own the cat and if it may help the noise ill suffer some loss. I know i wont get a muscle car sound from this exhaust but this is a little too much HONDA for me.

 

A cat will bring the sound down a lot and get rid of most of the raspyness. I Just got my downpipe put in and couldn't stand how loud it was and the raspyness so i got a highflow cat welded in. Now it sounds a little louder than stock with just a little rasp. Overall sounds MUCH better.

 

24 inch resonator

 

i know yhe resonator would do more and restrict less air flow (so more HP) but i bought the highflow cat already and this catback exhaust has a perfectly good resonator...so then the big question


How much HP will i be losing with this highflow cat vs no cat??

 

nothing that noticeable..unless ur on a dyno
just put it on for the sakes of not getting pulled over

 

Thanks all. I'm taking a day off in a week or so. Camgear, CAT and hopefully my hood and spoiler all will go on then.

 

Sport Compact Car did a dyno test on an 01 (i think) Civic. They compared stock cat to a high flow cat (magnaflow) and a test pipe/straight pipe (ebay). There wasn't much of a difference. High flow gained 5 hp over a stock cat and the test pipe only gained 1 hp over the high flow. So really if the sound is annoying you that much just put it in and if that 1 hp loss is noticeable then lose 5 lbs and your set to go!

 

Sweet I was expecting it to be a bigger loss.

 

what did u put on- just a catback or the downpipe and headers too?

 

header/dp and Cat-back. also did the motor mounts, swaybar and perches, and tiebar. cam gear is in the garage waiting to install, and intake manifold is backordered.

 

cool. i'm assumming u got to drive it around. how does it feel, u notice a big difference aside from the raspy noise?

 

Pretty good gains. I have a dyno visit tomorrow to get it tuned b/c im sure its lean now. so i havent really floored it yet. but by tomorow i'll get dyno numbers pics and a review of what i have so far.