I'm looking for a cat-back system form my 98 GT. My ride is more or less stock, and has 65K original miles. Because it's a convertible, and because of my stage in life, I'd like an exhaust that sounds good, but not too noisy. I think this would disqualify Flowmaster's American Thunder system. For some reason, Flowmaster does not offer the Force II exhaust system for the 98 GT...which is what I would opt for if I could. I have no idea why they don't offer it. Is there a reasonable substitute? Fit and finish is important, and I want to avoid 3.0' (or larger) outlets...the car is basically stock, after all. Thanks!