i've just has an ap clutch fitted to my R33 and the box seems noticeably more noisy than before,however i've not had the car long and the clutch was well knackered when i got it,hence i'm not sure what it should sound like with a proper working clutch.i used motul synth gear oil and replaced the transer box oil with mobil dexron2.it occasionally baulks 3rd to 4th(sic) and in gears is fine, its noisiest in neutral with a rotating metallic sound.should i be worried?thanks john.