hi can anyone help iv got a wrxsti my94 with standard 16inch sti alloys and iv started getting a strange noise sounds a bit like a high speed router trimming a bit of plywood lol its only happening if i pull away quick or cornering or uphill and only lasts a few seconds but it sounds awfull like im doing damage only thing i can see wrong is my turbo heatshield underbody is loose and not bolted on properly can this rub on anything moving or do u think it could be something else any help would make my day cheers lads