Its increased mostly above the frame rails. Its not a direct bolt on but very close. You may have to space the tank up slightly, make a elongated bracket for the top front mount, The Clarke I use still has the front mount. The IMS tanks that Ive used on my 03 and 04 250s eliminate that front mount and use L brackets on the sides of the tank. Not sure if they do it for the 05-07 tanks as well. I very slightly heated and reshaped the tank above the spark plug for clearance. Im also running a shorter plug. I can still swap the tank back to my 07 250 w/o any issues.