Used racing beat dual exhaust for 99-05. 2.5" piping I think. Mates up to factory exhaust AOK. Great sounding exhaust. Just quiet enough and just loud enough.

Had it on for about 80K miles. Dirty and not very shiny anymore. Elbow grease should solve that.

This is the model: http://www.racingbeat.com/Miata-1990...ral/56467.html

Local pickup only in MD

$210

 

I have this exact muffler and can say, it sounds awesome. I have no cats, and no resonators anymore, just straight 2 1/2" from turbo to muffler. My car is quiet, but when I'm on the throttle hard, the note is real mellow, Nothing fart can-ish. It's also stainless steel, so it'll last forever. Highly recommended by me.

 

If nobody buys this I will put it on my GF's mazdaspeed. Only reason why I haven't yet is that she doesn't drive her car now because she is in school.