[Modena]

Originally Posted by Paintwerks

I'm building a Pace 427SC here in Melbourne and intend to run live side pipes (with a cat after the headers).

My engineer has said there is no problem in running L & R side pipes, as long as they meet the noise requirements. He mentioned nothing about shielding, although I will likely be getting my stainless pipes HPC ceramic coated. If I have to fit shields, I will.

Pace's side pipes have a spiral insert that apparently makes them quiet enough to pass the noise test. Bernie is running them in his big block Kirkham in Geelong and has not been hassled.

my sidepipe design is using a perforated inner 2.5" tube which is wrapped in stainless scourers, but the next step for me to TRY to quiet them down for rego is to add the auger that you describe, hopefully it will make enough difference.