Hey guys, I'm new to this site but it seems to be a great place to get opinions on truck upgrades and mods. I have a 2007 Sierra (new body style) and am considering a performance mod this spring, either a cold air intake or dual exhaust. I'm more interested in improving my mpg but improved performance would be good too because I tow a boat over the summer. I'd like to hear your opinion on both and which one I should pursue, if you have any recommendations send them my way. Thanks!