elusive mufflers?

I've already searched and can't pin down what I need.

Looking for a race type muffler, single chamber, for my Demon. Loud is good, don't care about drone. Trying to find a pair that I can run steet and at the track.....no more dropping exhaust for me.

Size isn't important, but what I can't find is a 2 1/2 with offset inlet, center out. Need to connect the tailpipes.

Did find a SpinTech, but they sound kinda crappy. At least on my bud's car. I'm running Flowmaster 40's now but they are choking my motor badly! Need flow baby!

Any ideas?