Exhaust sound question?

[iblizzard]

I'm wondering what might be causing this sound..
I've got a 1990 Accord EX, with a JDM H22A.

I currently have this exhaust setup:
Megan 4-2-1 header -> 2 1/4" pipe -> resonator -> 2 1/4" pipe -> vibrant muffler

I'm getting a "ricey" sound... like a rattling almost.. around 2500-4000 rpms, and only with pretty hard throttle.

I didn't get this before, when I had this setup for exhaust:

Header -> 1 7/8" stock pipe -> catalytic converter -> 2 1/4" pipe -> muffler

Any ideas what might be causing this? Or is it just because it's much less restricted? Or could something be loose and rattling around a bit?

It's hard to tell in this, but I took a recording... This is accelerating in 2nd gear.

MP3

[PDXACCORD]

vrm vrm

yeah, mine had the same sound, I changed the resonator to a larger high flow one, mellowed our the tone just enough to get rid of that ratty ass tin can ricy hard to explain wot, power breaking crappy sound. hope it helps for you...

[h22sparkle]

you need a better resonator thats all

[bboygreddy]

u took out ur cat? that might just be why.. lol

[1fast_Honda]

Put your cat back on......Unless you have a turbo.. there is no need to take it off....Trust me i know...Ive done enought exhaust swaps back and forth.
Dyno tested them as well..Removing your cat only adds to the sound..And ricy is usually the outcome...

[blazen_accord]

I have almost same issue with the exhaust sound, installed an hi flo cat converter about a year ago and my cat back piping are from my old turbo setup whihc is 2.5" I also got a $300 ebay header. sound like ricey from 2500rpm to 3000rpm then sound mellow down and start ricey again at 3500rpm to 4000rpm. hmm maybe I need to replace my hi flo cat? it did go through 2 engine that was turbo and blew lot of white smoke out the exhaust when the engine blow up.. anyway to check the cat is still good??

[DrLove'sKuDang]

theyre right. a real cat is the only solution. a resonator is just a perforated tube... it will help but will not rid of the noise completely.

if you wanna get a cat, check out the 300 cell spun cats. ive seen results from bench tests and they flow about 13% more than a carsound highflow cat.

[aero]

I have the same sound on my car.. was pondering either a bigger resonator or an OEM cat. I have a carsound cat and 14" resonator. Sound is REAL annoying.

[nostringz]

increasing pipe diameter should help too. a second resonator may or maynot help but bigger is better in this case.

definitely put a cat back on. removing isn't worth the 1-3 horsepower increase.

[Losiracer2]

you could also try adding an 18" glasspack....as funny as that sounds, it works on my JDM H22A w/ Megan 421 header. I've got a greddy hybrid Catback w/ a magnaflow street series muffler. And its nice and deep.