ahh i dunno i only have 1 high flow muffler and myn is 2.5" and i think it sounds good really nice note to it not to dronny, it does make a bit of a sound in the car but i dont mind.

thanxs dregg where is the muffler in your car? the center of the system?

I was thinkin of doing this myself as I recently had the rear resonator replaced and it doesnt sound as good as the old one (that came with a Berkley system). Im worried its gonna be too loud though..

Also extractors and cams etc add burble and lump to the sound but dont really make it any louder.