http://www.youtube.com/watch?v=I5Exf4YaLms

its when i let me cluth up to and rev it to around 2000 rpm and also shifting from 4 to 3 and 3 to 2nd and reversing, and only when the car is hot, someone told me its the k&n filter but seems like the tranny???

 

Replaced the k and n filter and it still makes the noise, so i told them on monday to check the down pipes and the throw out bearings in the clutch anything else I should have checked cause i got them to tighten and check everything, ive had some warranty down to the turbo parts like hoses and clamps and stuff but even after that still it makes it, and if in reverse going backwards up a hill it really!!! makes that noise so there some pressure making the noise somwhere on the tranny or exhaust.guessing..

 

I have no idea where it could be coming from then. Have you tried it with the fan belt off just to rule it out?