On my last Supra i had a custom straight pipe that was 3in from the downpipe back with a 4in tip with no cat or resonator. The car literally sounded like a dump truck and was loud as fuck and over the two years of owning it i never got stopped for it. the only time i got pulled over for it was when i was running open downpipe through Citrus Park mall and some douche HCSO pulled me and gave me a warning.