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How an M4 made me decide against an R8 (for now)...and brought me back to the NSX.

For better or for worse, the R8 arrived earlier this week and I declined the purchase. I feel good about my decision to keep the NSX.

Now I just have to decide whether to do something to improve the exhaust sound. I really don’t know much about exhausts, catalytic converters, mufflers etc.

What is the best bang for the buck improvement to the exhaust sound that won’t create any issues with any state emissions or factory warranty?
This one should meet your requirements.