I have a custom built S/S surplus to requirements.
The system was made by Blueflame and is 3" straight through with nice 4" rolled tailpipe.
I had an RB Motorsport built R32 GTR with approx 630bhp but it was too loud. I had this system made and it was a lot better but unfortunately it couldn't flow enough. Rod Bell suggested that it would be good upto about 450bhp so we removed it after only one day and refitted the Super Drager (very, very loud).
The system is currently my friends premises at Pipewerx (see www.pipewerx.com). The owner of Pipewerx was the guy in charge of all one off system builds at Blueflame before he set up on his own.
If you were interested he is based just off J27 of the M6 and he could fit the system for you a make sure it all fits perfectly with your downpipes ect.
I have some images at home and could email them to you tonight if you want.