Version 6 STI - 4TH & 5TH Noisy under load?

[OskarHey]

Hey guys,

Yet again seeking help from the experienced and knowledge guys here as it's driving me crazy and want to try decipher prior to taking to the mechanics and splashing out - especially here in Queenstown they'll end up charging me 400$ alone for opening the door..

Anyways my MY00 V6 STI - Fully stock, just started making some odd noises as of the last couple days.. seems to almost be getting worse, but could just be mean.

Anyways i uploaded the video -:

[video=youtube_share;j4xAEG4TWWU]

You can hear it really clearly and distinctively throughout about half way through that video.

This ONLY happens whenever i am in 4th & 5th gear.. under load also, also only about 60KM till about 90KM.. Doesn't happen in any other gear at all despite the speed, also if im cruising under 50KM in fourth or fifth its still not noticeable..

Although whenever i am in 4th and 5th and put my foot on accelerator that noise can be heard very loudly.. sounds like its almost back of the engine/gearbox/diff.. but no noises occur when just rolling - even in gear if no acceleration there is no noise.

I just did a full oil change yesterday to the whole car, Engine, Rear Diff, Center diff/gearbox - using all Pentrite products - proper specifications too for the car. Didn't seem to make a change though.

Will take it into mechanics regardless i think to get it sorted.. but want to kind of have some idea what it could be prior to them saying i need 100 new things..

Any advice appreciated!

Cheers Guys.

[OskarHey]

Noisy even in third now ((((( could it be engine noise as opposed to gearbox? Gearbox is smooth as, hard to tell where noise coming from because so loud. Only above 60 KM an hour and accelerating

[loner]

sounds like the engine to me.