I was having a conversation the other day about horsepower mods for the XR650R and it got me thinking: are there specific modifications that will significantly INCREASE the bottom end torque of the XR650R? All I can really think of is a big bore kit or lowering the gearing which would obviously not increase torque output from the engine but would increase torque multiplication. From what I understand there are a few slip-on pipes that might improve torque across the entire powerband. Any other ideas? Dyno proven?