I have a 1994 S350. When I accelerate on the highway the car makes a noise from underneath that sounds like a whooshing noise. I checked the muffler system for a hole and did not find one. My question is ...could the acceleration whooshing noise be the transmission? I know it slips a bit when shifting. Could it just be having a really tough time getting the car up to highway speed? And if anyone knows...does this transmission have the K1 piston? Thanks for any help.