The ESC I linked is actually a 45A and the specs are well over rated for 17.5 on 2S, I also use the same 45A ESC on my 13.5 Wheeler which has also proven to be very competitive in my super stock car with a recent 1st place finish over a 6 event points series this past winter:
2016 Winter Series Results

Anything over 35A is unnecessary for 17.5 on 2S, the motor can only draw so much current, an over rated ESC won't make it go any faster, and if you get a heavier ESC with thicker 12AWG wiring then the extra weight will actually slow you down

I like to use lighter 14AWG wire in my stock cars to keep weight down and reduce the center of gravity, etc... every gram counts!