I do not know enough about the '05 to tell you how to modify it to reduce engine braking.... you are likely talking about the back torque limiter, or 'slipper' clutch. These are also generically called Sprague clutches, because of how they loosen up the clutch pack when the rear wheel slows more than the engine will allow -- the friction discs 'slip' against the pressure plates and limit the 'back' (reverse) torque.