My old setup was PLM 4-2-1, no cat, 1 cheapy resonator and xforce twin loop on 2.5' mandrel bent b16a2, I was way above the 91dB mark @ 4k RPM. No way I'd pass EPA Noise Pollution test.
Friend and I spent a whole weekend pushing an S15 under the 90dB rule, only to be told in the second test "We didn't see your blow off valve earlier, so get rid of that too" - wasted another $60 on testing. :O
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