I have the Flowmaster "American Thunder" dual system on my PT. What did you want to know? It was easy to install, sounds much better than stock, can't really tell if it added anything to performance. The upswept tips are kind of cool looking and I don't get the dreaded highway "drone", that's probably because the system not only has the muffler but a a resonator also. Only drawback so far was that, after I lowered it, the pipe hit the rear axle on hard bumps. I took it to a muffler shop and they tweaked a bit so that it doesn't hit now. Seems to be a good system for the price.
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