if you have a gst and were shipped a 2600 by mistake, then that is probably a very bad thing if you plan on doing any racing from the line. i'm downgrading from a 2600 to a 2100 in a search for faster 60' times. with a GST that makes decent power, a 2600 means you either bog or spin...no good opportunity to slip it. for GSX owners, a 2600 is great b/c they have no need to slip - they just get instant traction w/ 4 wheels.