I would imagine it is a very similar set up to a GTP but with larger tubing. I would say go with some flowmasters out back. I'm sure almost any local exhaust shop will be able to weld your stock tips back on. I would think 40s or Super 40s for very healthy note or 50s if just want a stronger rumble...and I would definitely leave the resonator in place if it has one, it will be much quieter inside the car.