No longer for sale on the open market. Shifts smoothly and prevents inadvertently shifting into a low gear from a high gear and prevents over-revving your motor. Comes without shift knob but has standard Porsche shifter rod so easy to find one. Price is $350 shipped and I take Paypal at pgeorge911@aol.com to family and friends or add 3.5% for guaranteed refund. Contact me at PP address for questions. Thanks for looking. Peter