another Q-------

[NismoNYCF240]

From the 89-93 s13---- is there any installation differences between them? I think i'm going to stick it out with ka24deT<--- seems I want close or over 300Hp..... I'm trying to find more answers Does any DOHC fit into it or is there a certain year that has to go in? ALSO.... cracks are on my frame towards the front going into the engine bay---- I know this is bad..... BUT is it that big of a deal or throw it in then look for another 240?.... The last question or statement---- -- Ka24de motor---- rebuilt stock parts from the piston rings to the oil pump-- t3-t4 top mount with front mount intercooler-- with a boost controller and full exhaust.... Do i need to change injectors?--- And can I flash the stock ecu to run the turbo on it or get an SR ecu?????? looking for a point in the right direction i haven't bought anything yet.... but the SR seems for 2,500 i'm getting a engine...... not rebuilt... i think i would have a safer ride if i rebuilt the ka??? ALSO.... if I HAVE a 89 ka motor can i just change the head on it to a DOHC....???? possible cheaper.... I have spare parts and HAve the right places to go for the swap I jsut want to make sure I overlook everything so there are no supprises..?...