I removed my muffler (not resonator) and installed a stainless exhaust pipe that TOTALLY fits the size and shape of the SRT-6 rear end. There is no resonance and the radio works fine without getting that BIG DRONE of most exhaust modifcations. I get lots of positive comments and it is NOT loud until I really get on it and it starts to get up on the cam / supercharger and then it is a HIGH $ sounding european sedan sound that is really nice, others words not mine. THe pipe is from Summit racing for a Diesel and is a twin 4" polished stainless setup. I cut and TIGed the pipe as shown in the photos attached if they upload. Click on them for a larger view. Also see my LSD installation for the rear end, Woody.

Seems that I have been educated a bit, the resonator was not removed, the muffler was. THe muffler was full of stuff and I will add a picture below to show the amount of junk inside of it, LOTS of fiber material and baffels. I first tried to open the MUFFLER and gut it but when I replaced it it did not sound any different. There may be a slight increase in power but my G meter was not used to see a difference before I started. The rich sound is nice and not loud inside, at normal highway speeds you have to try and notice an increase. When you firewall it the sound is quite nice, even better than my 6 pack 440 challenger and your hearing would say that it runs stronger. You can not go on the seat of the pants responce feel as it is less accurate. NOW the SPRINT BOOSTER is a real kick in the pants especially when you are on the track autocrossing and that is good for a second or two in a 45 second lap, its well worth it. Woody Photos of interior of muffler to follow below 1/19/2008

PS the pipes are even with the rear bumper from a top view. The curved body makes then look like they protrude a great deal. The sound levels in the car are even normal because the sound pressure waves do not interact with the bodywork and cause resonance, like my Challenger exhaust tips (1973 style) Woody Northern Va area.

I now have the video of a run on the autocross track on You tube so you can hear the car without the muffler, look up Autocrossing my SRT-6 Crossfire in Maryland. 1/24/2008