I had the stock GXP exhaust on my '06, with Norm's rear dual outlet fascia. That was a used exhaust that had some, um, quirks, but it worked for me for almost 50k miles. I won a Solo exhaust at the charity auction at NASSAM last year. I think the Solo system on my car looks better than the GXP, it fits great, and sounds good. It's definitely not loud. If you're considering a Solo exhaust, I'd talk to them about what you want in terms of sound and fit, and they can put together something.
