Hey there I recently bought a 1991 gts4 ran into some problems and turned out the hot side of the turbo took off. Put a used rb20 turbo in and it ran perfect for two days out of it before the alternator crapped out too. The car now smokes like a pig when I down shift, pure burn oil smell. Car pulls hard and doesn't smoke when I beat on it but when I downshift coming to a light it smokes out the road with white, but no coolant smell. I'm thinking I bought a blown turbo? Or head gasket maybe? It also has a bad oil leak now that I can't trace..... Please help with any ideas