Hey lemme chime in too! lol
Best bang for the buck mod... would be doing a set of test pipes. Or combine that with a nice quality catback exhaust as well. Then tuning it with UPREV. Freeing up the exhaust on the vq37s can free up 10+ rwhp and 10+wtq... we do this setup almost every other day
As far as passing emmisions, do not worry, as stated earlier, if you are uprev tuned we can disable the rear 02 sensors if need be, and we DO inspections at our dealership anyway
shoot me a call at the shop if you want to price out a couple of things and different options to go with on the car
631-366-2152
-Alex
Nick, chuck, jeff and bluerr = Thanks for the kind words