The wiring harnesses may be the same, but the ECU would definitely need to be swapped for a 1.8/1.9 version. The swap should be pretty straight forward, I'm just not sure it would be worth the effort to go from a 1.6 to a 1.8/1.9. The horsepower gain probably isn't too impressive between the two. Any larger than the M44 and your looking at a 4cyl to 6cyl swap which would be far more complicated. Its a ton of fun to drive though. (HUGO, mine says 325ti on the hatch......  ) __________________
SOLD!!! 1999 332ti //M Sport Titanium Silver
M3 S52 3.2 I-6 Engine, M3 Clutch w/ ti Getrag Trans, Z3 3.15 LSD medium case diff and half shafts, OEM Hatch Spoiler, Eurosport HP Underdrive Pulleys, FDM, 17" DS1 rims, M3 Front Struts & Springs, M3 Instrument Cluster, 3-spoke //M steering wheel with tri-color stitching, SSK, CCFL Angels in Depo projectors with 5k HIDs |