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I've seen some aftermarket exhausts pass at MRLS... I have a psuedo-aftermarket exhaust in my S2k which consists of OEM piping and resonator w/ Magnaflow cans welded on. I wanted something with better flow, sound, and weight savings and that would still pass MRLS and it does the job.
I've also seen exhausts like Apex'i World Sport, Fujitsubo, and T1R dual pass. The key seems to be a good resonator along with the mufflers.
I've been thinking of going the turnout route as well by making a "convertible" muffler. I bought some v-band clamps that would allow me to switch from the magnaflow cans I have right now to a custom straight pipe turn out angled to the left for MRLS and then back to magnaflow when I leave the track.
One more thing, even if you have an after market exhaust you can still technically get around the meatball flag they'll give you for sound. It's common knowledge that the decibel meter is on the outside right after turn 5. Wait to get back on the throttle a lil bit after the turn 5 exit and you should be able to pass and run the whole rest of the track w/o getting meatballed.
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