I have owned this car for some years now and been very happy with it..It has the m42 engine which is very tight and revs very high. and will run very well on the HWY with a 325 and still bring the gas home with ya.I have done lite work on the 91 318is and am sure that 325 is no slacker but its no Lambo either..One thing if you do get a 325 get a 88or 89 325is with the Blk leather sport seats. And try for the glass sunroof and all the opts. you can.But still the 91 318is is a winner in my books. I just love the way it sounds and looks..