I'm definitely partial to the Header route as it provides the most gains. Not only that, but, both Motordyne and Fast Intentions have exhausts available with cats. The two big downsides is generally the cost of the headers, and the install (cost/difficulty).
Test pipes just seem too rudimentary and unrefined in my opinion. Resonated TP's or ART pipes are a much better option.
HFC's definitely help with the fumes, but they could also rasp like TP's.
It's a guessing game outside of just a CBE change. Now that I have carbon bult up on my exhaust, I don't hear any rasp, but for the first couple months, it definitely had some when it was cold. PPE Headers have rasp, HFC has rasp, and TP's have rasp. Resonators or a damn good exhaust system will help out. F.I. LTH and CBE don't rasp, but that's the magic of staying with the same manufacturer.
Someone should make a thread of known non-rasp exhaust combo's with audio/video...
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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