right,been running about in the rs500 today to get everything bedded in etc.when the car comes on boost(even slightly) it sounds like a cross between a jet aeroplane and a straight cut gearbox whine.

it only does it when its coming on boost so can rule out any transmission noises really-it sounds like its really sucking air,but loudly.now the turbo didnt sound like that on the old engine and the engine didnt sound like that in the other car.ive fitted a new big k&n cone filter,could it be that.........it sounds wierd,but cool if you know what i mean.

cant really give it loads yet as its got to go to be set up with the new air injectors etc on the 26thapril-it seems to go ok etc-just very curious.