HWY HNTR

Hey guys, is there a sound difference between having high flows vs. no cats at all?

Thanks

C5XTASY

I have high-flow cats, they sound great and are loud. Not sure about the sound difference, but I suspect that no cats would be a little louder. However, something else to consider is the sulphur smell many cars, without any cats, give off.
Ed

nickolbag

It will be considerably louder without cats.

HWY HNTR

btw way, right now I have an aps setup with the 2 cats on 3" pipes from the downpipes back into a 2.5" corsa Ti. Will it be much louder....?

canyon lake corvette

I thought the sulfur smell came from the cats when a/f ratios were off?
I dont remember any of my early noncat cars having that smell

chevylad

I had some on another car and they quieted the exhaust sound some, but it wasn't that noticable. Every car is a little different. This was shorty headers on a standard 383 sbc, 2.5 inch exhaust, 2 moroso spiral flow mufflers and 2 magnaflow mufflers with approximately 400 horse at the flywheel. This was also a carbeuretad car.

black98c5

It got a lot louder when going from hi-flow cats to catless x-pipe.