ok let me set you straight here a 20v is NOT supercharged so it is p plater friendly 20valves come in two variets silver top and black top the silver top gives you around 120kws the black top gives you around 130-140 kws the black top is lighter but the trade off is its also a bit weaker both come with quad throttle bodys the black comes with vvti. the supercharged motor is the 4agze the block for this is good for a performance 4a motor as it commonly has oil squirters in the block for extra upper cylinder lubrication/cooling. if the sx your lookin at is a 90 model i wouldnt say itd be a series 2 im pretty sure the sx seca was the only one that came out with a second series that was produced roughly 92-93 and they were the only model to come out with power windows the trim options were also alot better as well. im fairly sure thats correct feel free to jump in and correct me anyone