YZF600 R6
 Hi Flow Velocity
 Stacks

These stacks drop on and, because of the improved velocity, richen the main circuit slightly - about 1-2mj's.  30mm/25mm combination stacks improve power at 12k and up. We found no decrease low-end and midrange when properly tuned on a 4 Gas  EC997 Low Inertia Eddy Current Dyno.

Excellent power improvement for very little work.
These US made v-stacks equal power improvement that equals and exceeds Yamaha Race Kit versions and have been tested to optimize lengths for use with stock and US "Supersport" types of engines.

Designed by Factory Pro. Specially manufactured, featuring a larger, more efficient "flare" for increased air flow.
Manufactured from aluminum alloy, these are 1 piece units that drop on and simply make more power.
Use the 30mm/25mm combination set - for 13k+ rpm

Take the airbox top off and drop them on, replace the airbox top and fuel tank and GO! (They really are better! Marc)
1-3hp in 15 minutes.

Measurements from bellmouth of carb to ~4mm deeper than the velocity stack screw boss surface.

Excellent for street and race classes that allow carb mods.
Add the 1.7-RK RaceKit for the biggest improvement.

  RA-VEL-Y78-3025  

   $249.95 
 (set of 4)

3 sizes, 12 pieces total
$500/set

pn: RA-VEL-Y78-TK

Available in: 20, 25, 30, 35, 40 and 45mm lengths