I've got the Tanabe Super Medallion and for my tastes it suits me fine (ricer). But the BPM twister has the best exhaust note for sure, pure boxer heaven and the power output is one of the highest. You can pick up Nolimit's used one for a lot less than going out to get any new one, it'll look the same in 3000 miles anyway. I'm not pushing Nolimits exhaust because he's a friend, but because the exhaust rocks!

 

Seconded!
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I just picked up a Vishnu turbo back dual tip. It looks stock, but doesn't sound stock. It removes the CAT in the downpipe, and has 1 CAT in the midpipe section. They also have a single tip version and if you want to spend another $300 you can buy their signature exhaust which has 1 CAT in the downpipe with a divorced wastegate/bypass setup. The signature is probably better for larger turbos.
I also have a Vishnu uppipe and noticed they now have one with a flex joint.

Many will say that Vishnu products are a bit on the pricey side, and there are other less expensive products out there. But I feel I have gotten my moneys worth. It has also been helpful in getting the correct maps for Engine Management devices (Unichip, ECUTEK).

I think it was mentioned, but there are also monthly SCCA Solo II (AutoX) events.

Tim