Ok, here is a small index of what to do to tune the 690: 1. First, remove the power restriction on first and second gear: http://www.ktmforum.co.uk/showthread.php?t=9429&page=7&highlight=unplug 2. Second, install Accrapovic mapping, it's done by the dealer/shop after you replaced the exhaust system. It will alter the bikes fuelsystem so that it gives the engine more fuel as needed when replacing the stock exhaust system. 3. Modify the airbox, remove snorkle completely. 4. Install chip that will give the engine enough fuel when airbox is modified. Please report if you find anything.