I had the Magnaflow x-pipe installed for $200 including the price of the X. It fits perfectly in the place of the resonators. Absolutely love the sound. The x-pipe actually makes the 55 sound more like an engine with a 180 degree crank. Here's a video I took in June at TWS. The mic is bluetooth mounted on the rear license plate.
TWS June 8, 08 Run 3 - Video