Nope, if they computer balance the crank it will be better then stock, but I have no issues with my stock STI crank at that power level.. The STI components are pretty good OE.. I am also running STI rods, which they could "match" so they are with in a closer tolerance to each other... But again I didn't do this, I do plan to have matched forged pistons, and rods in my next block (2.8L) and a balanced Crank, but my goal is 1,000whp for that monster..
02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."