Lowering kits for Aprilia V4 Tuono and Tuono V4 1100 ABS FACTORY by Lust Racing. Rear suspension lowering kit for V4 Tuono to reduce the seat height comes with two suspension bracket plates made in steel. The brackets replace the standard units that they replace. We measure the change in height at vertically from the rear axle to the upper surface of the seat unit. The Aprilia V4 Tuono lowering kit comes complete with installation instructions, manufactured in UK by Lust Racing Ltd.