Vibrant make really good Ultra quiet resonators, but not sure if they will fit since they are pretty fat. But at least they cut down the rasp and tone it down a bit.
MR-S with a 2zz swap and mods
EVO X MR - Phantom Black - Ti Exhaust - Ti UICP - AQM Intake - Sold
Z4 M Coupe - H&R - RE Diablo - RPi - Tekarbon - Sold