I just had a straight through muffler installed at the back of the car, no change to the actual exhaust pipe at this stage. I replaced the dual tips with a single tip that fits perfectly in the gap in the rear bar. It's actually a ford gt tip but looks tough at the rear. I have an m sport so I'm not sure if the gap on the stock bar is the same shape or size. Had it done at powatone in fyshwick for 350. I may go for a full exhaust at a later date but I wasn't keen at this stage given potential for warning lights. The sound is however dramatically improved.