Graves motorsports lower 50mm velocity stacks R1 2009-2014 ABY-09R1-REVB Speedster Dual Exhaust System 2022 Arai Brochure

2022 Arai Brochure

Pre-cut kits are printed on durable

2021 Indian Chief Vintage - - 2014-2019

90 CFM (Cubic feet per minute) @1

Graves motorsports lower 50mm velocity stacks R1 2009-2014 ABY-09R1-REVB Speedster Dual Exhaust System 2022 Arai BrochureGraves Motorsports Yamaha R1 Lower 50mm Velocity Stacks for the 2009 2014 models. These 50MM Lower Velocity Stacks with Pivots were developed by Graves Motorsports for your Cross Plane Crank R1. This item is the "Lower" stack assembly only (see item # ABY 09R1 REVT to purchase the top add on). This stack kit improves power throughout the entire RPM range. The staggered tops allow the cylinders to share the available volume of air in the R1s air box