what's the most quite exaust set up
 

Longtube header

expansion

Mufflers

this on a 66 nova with an 04 GTO LS1 motor so no cats


my 383 you could feel it but not hear it, the sound was very deep the only time it got loud was WOT.

With Lts and no cats your going to be loud. Are you going to run true duals?

You want a quiet muffler with no cats? Dynomax ultraflow is a high flowing muffler (straight through), but relatively quiet for a performance muffler.

The easiest way to get quieter and get rid of rasp would be to install a high flow cat or two though.

Yes. I don't know if it's because my 5.3 heads and F13 cam, but with LT + catted + GMMG my car is still loud. XR-1 going in shortly.

The slp dual dual muffler is very quite.

i would think about getting a hooker catback.

The SLP DD mufler is so quiet it almost sounds stock,......untill I open the cutout's. :devil: The best of both worlds IMO.

Why not install a similar system as to what you had on your 383, sounds like what your after?

Hooker

I was running some flowmasters I can't remember what series they were.

I might just run 2 sets of mufflers and dump before the axle.

slp d/d is close to stock sounding with long tubes and no cats. I'm running that setup with an electric cutout. It is the best of both worlds! :drive: