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I'm sure this system is crazy expensive (I can't find the pricing), but it looks awesome. It's made by Akrapovic (a really high end motorcycle exhaust company) that has just started making systems for cars. You can get it in titanium, which saves 46 lbs over the stock system, and you can even get carbon fiber tips. It comes in manifold-back or axle-back:
I know they're crazy light compared to most systems, but to be honest I feel like they're going to have a hard time selling them at ridic expensive prices when there are other exhaust options that also sound absolutely amazing.