vette1: Top speed with 2s on the 4600 was ~47mph. I can still add one more cell for 3s, which should bring it up to ~60, but it's already plenty fast for me. This project went from an "on road" project to "on track" project. :) The only local track I know of is too small to hit those speed without spinning out, so I'm happy.
GorillaMaxx360: That's ok, we'll forgive you... this time, but don't let it happen again! ;)
neweuser: When using 2/2" rims with the RPM arms, you have to replace the hub pin retailer cap screw with a grub screw on the rear so it clears the inside of the rim. For the front: you have to shim out the tires with a few washers. I did get a set of those 2.8's you were talking about, but they seem to be out of stock online a lot and my LHS doesn't carry them yet. They are the imexx rims/tires.
These are what you are talking about...