i believe you can use the trans from any 89-91 si or 88-91 crx si trans. the 88s I believe had a smaller disk area so you would have to buy clutch parts according to what you bought. I believe the si trans would make you quicker but since its just a trans and not actuall hp I wouldn't expect a major difference just quicker shifts and a less sloppy gearbox. In terms of price I paid 200 for mine with a 1 year warranty I have seen them cheaper.