Quietening Sidepipes

[Jaydee]

How much power would you lose if you went under the car through a muffler and then double backed through the side pipes? Sort of like a truck exhaust.
JD

[David Hodgson]

Originally Posted by Jaydee

How much power would you lose if you went under the car through a muffler and then double backed through the side pipes? Sort of like a truck exhaust.
JD

You may actually be able to gain power this way. Utilising better headers than the shorty's most guy's comprimise with, and good flowing performance mufflers and back through low restriction side pipes, may not cause the losses you would assume.
BUT, most Cobra floor pans and ground clearance don't allow for a muffler to be fitted before the rear axle unless you have the car jacked up like a daily shopper, and you wouldn't want to plumb the pipes past the rear axle twice. The usual set up with under floor systems is a slim resonator (torpedo/hotdog) before the axle and main mufflers after the axle. Even fitting in the cats is an issue.

[Don]

When rebuilding my side pipes, I placed a modified Harley/Davidson exhaust baffle just before the turnout. At the time, there were different models of the baffle, don't recall the specific one I used.

The mufflers are the 427 Corvette side pipe mufflers, heavily modified.

At the front end used, the Car Chemistry 3 disc exhaust inserts. Reduced the size of the hole in the center tube.

Car Chemistry Exhaust Inserts - SummitRacing.com

With the set up, significant sound reduction was the top priority, accepting in advance what ever power loss there would be. My Z06 with a Bassani X pipe and the Borla Quad Stinger Exhaust is louder during acceleration etc.