yes, get a new gasket. it shouldnt HURT performance, but you def. dont wanna suck any dirt or dust or anything in to the engine...
the stock boost gauge is WAY OFF, but yes, its normal for it to go all the way up, even though you are most likely only boosting at 9psi (unless you have done the FREE BOOST MOD), it has nothing to do with the leak.
as for the shifter movement, mine does the same thing. what does it mean? dunno. maybe just from the torque, maybe we could use motor mounts. hopefully someone will enlighten us
