Although Arthur and his parents own a A10 Toyota MR2 with the 4A-GZE supercharged engine that Ed gave them, Ed also gives them a W20 MR2 with the 3S-GTE turbocharged engine at some point in time in the movie upon the W20 MR2’s introduction in the early 1990’s.

Below is a link with an example of a W20 MR2.

http://www.thebarnmiami.com/1992_Toyota_MR2_Miami_FL_256143524.veh