[Kevin M]

The BPM design is probably better than Vishnu's. I doubt they stopped selling the standard exhaust, unless the exchange rate got so out of hand it's almost as expensive as the Signature. A bellmouth design like Nate's proprietary one is probably as good as a good DW pipe though, especially when you have the cat in the downpipe.

Also, Vishnu doesn't recommend their stand-alone downpipe (or any other like it) because of the taper at the end. They will always recommend you buy a complete turboback unit (even one that isn't theirs) before buying a downpipe that works with stock components.