You will need the S15 rear end to make your guage cluster work correctly. The sensor for your speed is located in the rear end. Unlike the S13/S14 which are located in the tranny.
The wiring on this motor is a pain in the @SS. We were the first ones to do this swap using all S15 stock parts and it was not fun.......... The wiring is nothing like the S13 or S14.
The emission thing should be no problem as long as your motor is running good and have a good Cat on the car.
Grumpy
www.mckinneymotorsports.com
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