Ok..so ive just picked up an 05 wrx wagon on friday. Been cruising the thing around a bit and noticed that when i downshift to third and second when im at lower rpms theres a quick second of shuttering right before the engine revs up. When i down shift and accelerate( say im coming out of a good curve and i want to punch it on a straight away) i feel nothing. Car had extensive work done to it before i picked it up. New clutch, new pressure plate, turbo, engine work etcetc...about 6000 worth of stuff done by the subaru dealer i picked it up from. Any ideas? My friend was saying its a combo of leftover pressure in the turbo and perhaps some breaking in with the new clutch. Ive been trying to stay under 4000 rpms (however hard that may be) and baby this thing. Everything else has been wonderful. Please help!