Hey folks picked up my new car yesterday an my94 Classic wrx.
On the way home particularly in 5 without beven being on boost im hearing a whistling noise, now this noise gets higher as you accelerate, but it goes away the second the accelerator is released. Just wondering could this be the turbo on way out, although I do have solid boost at standard levels and no smoke and no performance drop! Or could it be a loose hose? There is No mods whatsoever on the car bar a HKS Dump Valve.

The noise is Mainly in 5th gear although sometimes can hear a lesser noise but still same in 4th, a whistle or whine noise coming from what sounds like the engine as opposed the gearbox (as im worried it could be this)

If you accelerate from any speed in 5th you get this noise and it gets higher as you go up the revs. If you release the accelerator at any point the noise goes away. No crunching into gears or anything like that. I would have thought if it was a boost leak it would happen in any gear, and have checked all the hoses and appear to be ok.

If anyone has any ideas please shout as its driving me nuts!!!

 

To be honest is sounds like boost building up.
Im sure it makes the same noise in every gear u just notice it more in fifth
because you spend most time in this gear.