[RICK LAKE]

DanEC Dan don't want to break your bubble but there is alot of dead air behind a cobra and that noise will carry back into the car, the same as side pipes. Add down pipes on the ends for about a 45 degree down and out. I ran a 452 with a hydro camshaft and 9.2 compression the stock system worked great. I raced at New Hampshire track and pass the noise limit where others failed. This was with the ERA side pipes. MY race pipes are a different story. Just my own observation on my car. Rick L. I do also have heat rapon my headers under the hood to reduce heat along with the Hot-Jet coatings of the pipes.