VHM 04-06 YAMAHA R1 COMPETITION SERIES EXHAUST A new development from the Race Shop - "The Competition Series Exhaust" - FOR RACING USE ONLY Designed exclusively for drag race applications, this 4:2:1 exhaust is the ultimate design for peak power on stock, heavily modified and nitrous engines. Quality, lightweight stainless steel construction. Tapered head pipes and full merge collectors for maximum performance. Slip fit collector joints with "dual swivel end retention springs". Tuned length megaphone with optional baffle. O2 sensor bung in collector for wideband air/fuel ratio monitoring. Weighs only 9.8 pounds, over 10 pounds lighter than the stock R1 exhaust. Includes spring puller tool. Fuel maps available for many combinations.