Sound of cat bypass with stock muffler, 3.2?

nesslar · 07-30-2010, 07:09 AM

Wondering what to expect from the bypass pipe install, how it will sound.....

Talewinds · Talewinds's Garage

I noticed almost no difference in "loudness" or sound quality. Maybe a handful of decibels tops.

goat · goat's Garage

Same here. The sound is maybe a bit deeper, but not really louder. I am running a fabspeed bypass if that makes a difference.

nesslar · 07-30-2010, 08:17 AM

Thanks. I'da thought it might be a touch louder (not looking for that) but figured a little "deeper" tone would be a real good thing. I guess I'm basically looking at maybe freer flow (a few more horses?) and more pollution....though my car has always tested super clean.

McLovin · 07-30-2010, 08:46 AM

A little deeper, a little louder, no hp (the stock cat is plenty large and flows well), more pollution.

KCTarga3.2 · KCTarga3.2's Garage

I put on an M&K on my 3.2. Probably a touch louder at idle, and not enough sound while driving to tell. I am not sure it makes any difference at all sound or performance wise - but it is definitely lighter than the cat, and a fun/easy project for the weekend. I am very happy with the quality of M&K.

rusnak · 07-30-2010, 11:10 AM

It's cheaper than a cat, doesn't wear out like a cat, and lighter than the cat.

nesslar · 07-30-2010, 12:11 PM

All good. I'll be slapping it on there....ordering gaskets.

nineball · 07-30-2010, 12:13 PM

i put a dansk pre-muffler on my 3.0 and i am very happy with the results. at idle and below 2k it has a deeper tone but not really any louder. above 2k it sounds the same as the cat did.

Justin@Athens · Justin@Athens's Garage

YouTube - Cat by-pass with stock 3.2 muffler.MOV

craigyirush · 07-30-2010, 03:10 PM

But surely the more important question is whether you go any faster

Justin@Athens · Justin@Athens's Garage

You want loud? I got loud.
YouTube - Cat-bypass with muffler by-pass.MOV

Lindy · 07-30-2010, 03:31 PM

Just installed an M&K cat bypass (pre-muffler) on my Euro 3.2 last weekend, and have not noticed a change in sound or in power (at least according to the highly calibrated butt-dyno)...of course I am used to '60's cars with very loud side pipes. When I fire up on of the small blocks I can't even hear the 911 running - need to fix that!

The install of the M&K took less than 1/2 hour and fit perfectly. The weld quality is outstanding.