Although this topic has been tossed around before now, I always enjoy discussing it again.
I have the Supersprint Magnums on my BEAST and they absolutely look "Marvelous" as Billy Crystal would say.
Before purchasing aftermarket exhaust for your car, you should first decide what you hope to gain from it?
1) performance - Don't do it for the performance gains. Even though you may get an extra few HP (5-7 more is what Dinan claims), you will certainly not feel the difference in power.
2) looks - Each exhaust system has its pros and cons when it comes to looks, so try to get opinions from folks who have each one, as well as pictures and/or in person viewing whenever possible to help you with your decision.
and last but not least...
3) sound - This is where most of the aftermarket exhaust systems differientiate themselves. The Dinan exhaust sounds very good IMO, not too loud, but intoxicating during acceleration!

My Supersprints on the other hand are more subdued, but a definite deeper rumble than the stock mufflers, especially during hard acceleration. Of all the ones I've heard, including my own, the one I like the most has been the Kelleners! Man, that is a very sweet sound coming from the rear of the BEAST! If I didn't like the way my Supersprints looked so much, those are the ones I would choose.
Good luck with your decision.
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Andy
2000 Imola M5 / Black Nappa - Titanium Trim