MWR high performance velocity stacks for Yamaha R1 / M 2015-2019

Completely new velocity stacks for the new 2015-19 R1, lower stacks / upper stacks & bolts. The first tests have already been done by WSBK & BSB teams showing that the MWR stacks deliver the same power as the official YEC stacks.

The installation instructions are also included, which is also included with each set.