Both options will give you that. The QSC kit for $219 will net you 3+ lengths over a stock machine in 100 yards with no top end loss, stock to stock tires. The airdam/cvtech clutch at $650? is not really any gain on a well clutched Polaris. The Polaris primary clutch is what Team, QSC, and others base their design on for the other brands to convert to. IMO it's a waste of money to change out the original Polaris for another companies imitation of it. I sell a lot of QSC primary clutches to Can am guys for $840 set up with weights and spring. They are a modified Team/Polaris P85 made to fit the can am crank. They have a smaller diameter bearing in the center, vs can am or airdam, which gives a lower starting gear ratio in the clutches from a stop. In some machines, as much as 30% lower. On the Canam machines it's a huge improvement in low end and efficiency. The Canam primary is pressed together and the outer face slips on the shaft if clutched aggressively or used with big tires and high HP machines. That translates to belt slip and lost power to the wheels.
So, "bang for the buck" on a Polaris, a clutch kit is the best money. For an all out racer, it's still an eternal debate between them as to what works and what doesn't. On any given race day it seems they go back and forth and are about even. What's funny is the other brands are all using the Polaris or another similar design to it instead of the original stuff they came with.
As far as the QSC clutch kit for the 50, stall will be 1600 and is adjustable to 1800, 2000, or 2200 if you want to. But in most cases not needed. You will get smoother engagement in fwd and reverse, elimination of the reverse jump they do, more low end and mid range power and no more 0-20mph lag time before the power comes on.
