technically..ex/si tranny has a lower gear ratio(4.250 as compared to 4.058 and 3.250)...the higher the number in the final drive the lower the gear ratio which =s better acceleration. the si has a .750 5th gear and the ex has a .702 5th gear. These tranny's also have a tighter 1-4 than your dx/lx transmissions....id say get the ex tranny if you want to save a little fuel out on the open road...
is this going in a 88-91 car? if you use the z6 flywheel youll need an 89-91 si tranny...if you use your own flywheel and clutch you will use the same year transmission as your car.
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