Taller gears in the transmission reduce the overall reduction factor of the gearbox. If the engine is powerful enough to pull the taller gears, this modification will also raise top speed. Only use with tuning kits! Original cylinders are normally not powerful enough to pull this sort of gearing. Contrary to common gear units, the ones from Stage6 come ready pressed and are available at an unbeatable price. Simply replace the old gear unit with the new one - and that's it! Attention! Since 8/98, primary shafts with bearings are used. Please check before ordering.