well i passed my emissions down here, i was really suprised to. but it can be quite all that matters for sound is the choice on your muffler. if you get one that has a silencer on it you will sound almost as quite as stock but with a little meaner tone to it. mine sounds loud because its a straight through with no silencer i have a video of mine with it was 3inch DP and then at the DP it went to 2.5inch and to a straight through muffler with a silencer built into it. and it was pretty quite
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7MGTE - 500hp  never dyno'd
exhaust: 3inch pipes no cat/powerhouse manifold/garret gt47 18psi/HKS SS racing wastegate
fidenza cam gears
intake: PHR 4inch intake/K&N filter/3 inch intercooler/ pipeFMIC/greddy type R bov/
fuel: 550cc PTE/ walbro 255lp / Aeromotive adj pressure regulator
transmission: Fidenza flywheel/ACT extreme kit
electronics: map ecu 1 / HKS EVC 9
gauges:boost,EGT,oil temp & pressure/aem AFR
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