That's right u read the title right...my plans are to put an sr20det into my Geo Tracker lol. A Geo Tracker is rwd! I have some questions. Which sr is the best for HIGH hp applications, s13, s14, or s15. Will the s15 6speed tranny hold high hp, and how much of an rpm diff does it make on the highway? I want to know if i could run the engine totally off an AEM EMS, or some other form of standalone unit? By doing this would it allow me to use all the functions of the car...mainly the lights, blinkers, etc? I am aware that i would have to buy all new gauges to make the gauge cluster work, and i already have all the drivetrain issues worked out. ANY imput towards this topic would be greatly appreciated........Oh and i know the question is gonna come up, Why not just buy a 240?? Well the Geo Tracker weighs about 2200 lbs with me in it...not to mention I want something that noone else has.