as i may be the only one on IA to have both an rb25 and an sr in the same car i feel the need to weigh in on this conversation.

the sr is a very very very good motor, i mean its damn near perfect. it gets good gas mileage(i did about 30mpg hwy), its dependable, and the parts are readily available. you can make lots of power(as a percentage increase over stock) on the stock short block. the problem with the motor is where it makes power, below about 3500rpm your seriously ****ed for power and the bigger the turbo the worse it gets (its not nearly as bad as a honda). means a lot of high rpm, which is ok cause the motor will take it.

the rb25 (and all rbs in general) is a **** kicker. a steel turbo and some sort of afc will net you over 300whp. its got tons of torque and actually does pretty good on gas(im getting around 25-26mpg city and like 28hwy). its easy to drive everyday, lots of times i dont have to down shift like i did with the sr, and as far as track and mtn driving the sr cant really stand up to it. the only down side is parts are hard to get and its hard to find a competent mechanic.

id take the rb over the sr any day.