Why bother removing them? The resonators are designed to remove annoying frequencies from the exhaust charge, the rear muffler does the majority of the sound damping. If you want to increase the noise then the rear muffler is the place to do it. I have had a custom system made for my 560 and it sounds great, I used a reasonably common (in NZ) rear muffler for similar sized engines from a sportscar shop.

Matt.