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That's actually a good piece. I forgot they sold the rear section for the RTs. I saw a dyno sheet with the gains that it made. I think the dyno sheet showed that it gained like 3-5whp by itself. Other than that, Thermal makes great products.
Is your car an RT or do you just have the RT muffler?
i have a 01 R/T with the Thermal exhaust and its pretty decent. I cant see any difference in power but it gives it a different sound than most mufflers so i like it. i dont even know how much they cost cuz i picked mine up for cheap used but id say its def. better than stock