I put a Sidewinder/5700 combo in my 2WD Slash and it proved to be too much. There was so much wheel spin, it was slow getting started. It was a handful to control when it did get hooked up. The 4600 is the better choice for something like a 2WD Slash.

I've actually dropped down to a 3500, but only because I wanted to be able to run 3S.