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I just wanted to include my 2 cents in saying that the TRD exhaust is manufactured by Gibson, or at least uses a Gibson resonator as I can see the word "Gibson" stamped on it. It's a high quality piece, well designed, and sounds nice. I have a Berk test pipe that eliminates the secondary cat (stock header) and it's pretty loud now, but manageable. The test pipe added some higher frequencies for sure, but not offensive. With a catless header it would be nuts, and I would consider going to a resonated test pipe.
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