I have true dual super 40's with 2.25 in piping. Right now I'm running a 327 built from block up. Dynoed at 403hp the other day. Before I got it dynoed I had on stock rockers and stock heads. Now that I have Performer RPM heads and Fuller Roller rockers it is the ****tiest sounding exhaust ever. Its bordering on r.ic.e. Its so incredibly ratty sounding. When I'm going down the road and step on the gas all that comes out is a high pitched ratty sound. But at idle its the deepest sound I've ever heard and can be heard from damn near a block away. Any suggestions on getting rid of the ricyness and rattines. No the pipes are not mandrel bent and have gotten a few scrapes since I have v6 suspension in my car.