[Formulajones]

I've switched back and forth between Race and Street Pro's on a couple different cars when experimenting. The Race Pro is definitely quieter than Street Pro's, despite what their names might insinuate.

The problem with both of those mufflers if you're looking for something quiet, is that they are short 14" mufflers so they are only going to muffle sound so much. Pypes doesn't make them any larger unfortunately.

That's why most people go for the Dynomax as they are available in 14" and 20" so if you're looking for something with a little more noise control, obviously the 20" will do a better job at that.

These days I typically always go for a Dynomax muffler, either turbo or welded case depending on application.