First off, define "Stage" ... every aftermarket tuner's idea of Stage 1 is different, therefore their Stage 1+ will be different. For example, Extrememotorsports in Maryland make aftermarket kits for the DSM crowd ... they own/opperate Sean Glazer's record setting DSM. Regardless, they have up to a stage 8, but stage 1 is a filter/cat-back ... stage 2 is upping the boost ... so on and so on.
