Well, the only authorized distributor in the states is King motorsports, and last I checked, they had them for like $975, though if you look on ebay, I found mine there new in teh box for $700 and change shipped, which was a great deal in my opinion.

You may also, for about the same price want to talk to Dave or John at SMSP and Hytech, they both do custom exhausts, and actually, I've seen a twin loop design that John from Hytech did, that was gorgeous, and from my understanding performed very well.

There are exhausts out there that perform far better than the Mugen, it just happens in my opinion sound the best, and doesn't drone at all...

Any way, I got a final in Five hours, and need some sleep....

Later,
Aj