Ever since I got my GT4 back from having the gearbox reco'd & clutch replaced, the engine gets really noisy when it hits 4000rpm. I never noticed it before - just wondering if all you 3SGTE owners notice the same, or if something's amiss. Happens in any gear or neutral. clutch in or out.
It's an ST185 with TVIS, which I know kicks in at about those revs, so I'm guessing it's probably something to do with that.