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Sway bars make a bigger difference. If you were to look even just a little bit here is a post that compares the available brands directly with comparison information.
I'm trying to not close this thread because of the awesome amount of redundancy in your posts. If you just browsed the thread titles in this forum you'll find your answers already there in detail. Don't be lazy. I'll even start you off. I didn't even search. Just looked at thread titles on the first page of the sub forum. C'mon man! As far as vendors, are you aware that we have an entire forum for vendors divided up into different types of parts for the G37 that you may be looking for? They post in it all the time. Try looking there.