I patterned the system on my 5th avenue similar to the stealth bomber. I used "cheapie" summit 1 5/8" headers, to 3" 409 stainless collectors, then mandrel bent 409 stainless to a stainless magnaflow dual 3" in/3" out Y, a 3" stainless flex coupler to a dynomax 16669 3"in/out/internal "large body hemi" turbo muffler (10x5x22" case), 3" 409 mandrel bent over the axle, a 3" glass pack in the tailpipe (really helped with interior resonance/drone) to a gibson 3" turn down tip. sounded very nice...here's a clip I put on youtube before I sold it

http://www.youtube.com/watch?v=QvZ2lqPzogQ