why can't the people over at smarty make it on the fly? only thing i don't like about it. what do you guys think i should go with? i have the torq tube mod, and a straight pipe. looking for better mileage and that eelout factor in the butt dyno, cost isn't really a factor but i only want to have to do this once, also, are there any stacks or upgrades with the smarty to improve performance?