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I think you can add the Q300, Perrin 2.5" resonated, and Thermal to that list. Dezod is notably louder as far as I know. Perrin is the lightest by a few lbs. Q300 is heavier than stock. CSG and Thermal are close to the same weight (my scales only measure to the nearest lb and Thermal came in at 37, 36 if I removed the bolts and such) - the CSG may do the best at managing airflow of the bunch.
I'd also recommend sticking with the stock front-pipe - not going to get 100% maximum gains, but still really solid improvement. In fact, you could probably just run the whole stock header-back... if quiet is your goal.
I'm currently running the stock front-pipe + Thermal - it makes some noise when you get on it, but nothing close to the system I had on the old car (Nameless header, JDL 3" ultra-quiet over/frontpipe, 3" JDL D2 resonated) - especially at highway cruising rpm. I'll be updating to a 3" catted/resonated front-pipe shortly (hopefully this week) now that I fixed it so it fits the bolts... (yay for custom made pieces that have to be modified to work/fit properly...) - will be curious how much louder it gets.
C
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