the issue i can see you having, is not being able to trade your car in at garages and get a good price, because its a modded motor. so if you stand to benifit cash wise on doing a swap with the guy with the honda, i would do it, that way you can get the car you want easier.

but as for keeping the honda, not a good idea, i had an EP3, and long story short, the EP3 is a great car, but the impreza is just more fun