i also agree with thoots.... power wise the 4 cyl has plenty. not sure why you'd really need more.... i'm on and off the highway and in and out of traffic on the highway and in city driving every day during my 35 mile commute to work (70 both ways).
i have no issues with power. i never feel like i'm lacking. i have never had an issue with accelerating onto a highway or accleerating from a stop at a light.
of course my prior cars were civics....
but it still baffles me as to why anyone would really need more power....
