aparantly none of you guys know of the potential of the B20 that comes in that car. Keep the B20, if possible, get a JDM B20 motor (3rd gen prelude motor, not CRV motor). the newer B series motors are different and will be a pain in the ass to install. as well as an H22. PM me or OaTmEaL if you need more info for your 91 lude, hes a guru when it comes to that car. He had a JDM B20 and ripped on swapped integras and civics all day