[DarkAngel]

You dont need a new piston (Half tooth) for helicals. Its "recommended" by the manufacturers that you do, but Ive ran helicals in the past with standard pistons without issue. Full-Teeth pistons are utilized for gearsets under an Infinite Torque-Up set as the sector gear driven teeth are smaller in diameter than the piston pinion teeth.

Furthermore, Avoid Systema Gears like the plague. They were great once upon a time, and if you have an older set, they are like gold. However all the new systema stuff comes out of china now, the materials are shit and they strip/shear teeth off like crazy.

I regret selling my older helical set.

Go with a prom torque up set. Thats my recommendation.