With the tranny out the B2 piston will be a delight to at the very least inspect! You'd only need a couple inexpensive seals if everything is intact, but if there is any question regarding the integraty of the piston replacing things on the bench is a dream compared to doing it in place.

How about upgrading the K1 shift kit also again the parts from the dealer is only $11 dollars and again doing it out of the car is easier than with the tranny in place unless of course you actually do enjoy an ATF shower once in a while!