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You can't go wrong with the TRD, Nameless, Perrin, SRT, or the ARK exhausts imo. I have personally heard the USDM TRD catback, the SRT catback, the Nameless axleback, a straight pipe, and maybe a few others that I don't recall off hand.
The USDM TRD sounded the most like stock and was the quietest by far. I like the look of the tips. They fit the body lines of the FR-S well. Not sure how it would look on a BRZ.
The SRT catback (which I own) is loud, not as loud as the straight pipe but it is otherwise the loudest FT86 exhaust I've heard in person other than the straight pipe. I am not a big fan of loud exhausts, even though this exhaust sounds very deep and produces a nice boxer note. I think it has the best looks out of the bunch, but there are no dyno's available.
The Nameless axleback is in between a stock-like sound and the SRT. When you hear it you can definitely hear the increased bass in the exhaust note compared to stock. It's an apples-to-oranges comparison in terms of sound versus the SRT, though. The SRT is loud, rumbles, and sounds mean as hell under load, but the Nameless is milder while still being aggressive and burbly under acceleration.
The custom straight pipe was 707FRS's and was a completely different kind of loud compared to the SRT. Not only was it louder in terms of DB, but it just roared after 2k RPM.
And now, I have the SRT catback paired with a Nameless downpipe combo w/ Hemholtz resonator, which makes the SRT even meaner sounding, gives it a more of a hint of boxer, and quiets the drone.
You could go for the full SRT headerback, I guess, but I decided to do things in stages and make an unholy Frankenstein (SRT/Nameless) of an exhaust...I guess it turned out pretty well!
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