Sinister Line of Performance Engine Kits are Launching!

sinister107 sellshtExtensive research and development has gone into our new "Sinister" line of engine performance kits. HSS designed CNC cylinder heads performance matched to the best engine components available allow us to offer our customers repeatable and dyno-test proven horsepower for "feel-it-in-the-seat" performance! Sinister V-Twin packages for 103ci, 107ci, 117ci and 124ci displacements.

Click on the Sinister 107 Proof flyer to enlarge!


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