4-2-1 Sidewinder-Hayabusa (1999-2005) Brocks Performance Products proudly announces our 4-2-1 © Sidewinder Exhaust Package for the 99-05 Hayabusa . The Best of the Best Drag Race Exhaust System Available for Modern Sport Bikes. Uniquely constructed of an aerospace quality ultra-light weight stainless steel in a FOUR into TWO into ONE configuration for a smooth torque curve with a megaphone induced peak power punch! We have combined our knowledge gained over the years racing our hard launching StreetSmart Systems with a purpose built Race Megaphone. A removable 2 ¼ outlet Billet Aluminum/stainless steel/fiberglass constructed baffle is included. As usual, our oversize tube design (Tapered 1 ¾ primaries meet DUAL 2 secondary pipes which merge into a velocity enhanced 2 ¼ collector) complements the ram air efficiency of the mighty Hayabusa. BIG engines and Nitrous bikes LOVE additional pipe volume. But, the tapered head pipes prevent lost bottom end power for a hard launch and maximum acceleration, even with a stock engine. The entire 4-2-1 Sidewinder system weight in race trim (no baffle) is a mere 7 ½ lbs&.baffle installed is two lbs heavier with little or no performance decrease in applications under 200 HP. Ground clearance is at a maximum when using a Brocks Performance Billet oil pan: http://stores.skipjack.com/brockracing/Detail.bok?no=174 The system is spring mounted for easy removal in race maintenance situations which also makes oil filter replacement a breeze. As an added bonus&the STOCK OIL COOLER can also be retained or bypassed with the kit included with the system. Added to all these features is a high luster show polish and our sweet looking Brocks Performance by Hindle logo plate: