I wouldn't say flushing a toilet..more like popping bubble wrap into a megaphone with a pissed off bumble bee stuck in there.

Get rid of the converter...and if you have emissions...you can buy a piece that looks like a converter but is in fact a straight pipe though it...but no one can tell. You can buy that for like $30 at Frozen Boost. Another option is like said above...replace the stock resonator with a long glasspack.