Go for a b16a1 over the a2 ....the a1 has the cable tranny as to were the a2 has the hydrolic tranny.......Which means more money to fix ......The b16 is a great motor to build on if yur wanting somthing bigger i would go with the b18 which has more torque.........Plus the b16a is a simple install.....Since you have the si there are only I think 4 wires you have to add...........
Good luck and keep us posted ...
TY
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