I just bought an 07' that was still new from a dealer. I have a 1 yr warranty so I don't want to void that but already have the urge to do some upgrades. Where is the biggest restriction? The intake, the exhaust.......? What do you guys think of these "IGNITION REV BOX" Power Modules? They seem to allow the engine to rev higher and advance timing but I'm sure it's not good for the engine. Nerf Bars? Skid Plates? The rear brake and sprocket seem to be pretty low so I'm thinking especially about protecting that. Any input would be much appreciated. I tried to search but there doesn't seem to be a whole lot of specific info on the TRX-400.