Ok, now that I've done some research on potentially moding my '02 650L I'm pretty sure all the jetting/slide drilling/ needle shiming/ airbox opening shinanigans are pretty much not worth doing without opening up the exhaust as well. I've read a lot about Daves mods and know that he runs a stock exhaust, but this confuses me. Looking at the directions for doing this mod, it seems a lot of effort to do if not also opening up the exhaust. Yet someone with the skills to yank the carb and do all this and motivation for a faster smoother accellerating bike doesn't add an aftedrmarket pipe?Is the stock pipe less a culprit of the lean stock condition than the jets and air intake? I could buy this yet for all the disscussion of brandname pipes in particular.Guys describe different pipes as being stronger in low, low mid, top end etc. Can a pipe alone effect powerband at different rpm with all other things being equal? this seems weird if "daves mod dave" is happy with a stock exhaust. Isn't ann exhaust pipe essentialy just a coffee can with different amounts and shape of baffle? I could understand if we were talking about a bigger header pipe diameter or just an overall opening effect with a bigger pipe but different types of powergains in the power band just from the brand of pipe, sounds a little fishy?