Bought 1990 TT 2+2 Auto from japan. Fujitsubo cat-back. Stock air. looked under wood panel & saw "remanufactured" by nissan on computer. Phoned local nissan & service guy said was probably replaced before. He didn't know if it may have been tuned. Said its good as original. Could it already have upgraded UCU? Can drift on dry pavement. Is this normal?