I would post this at
http://www.spyderchat.com
I'm sure they would be more than willing to share their thoughts on this topic. I can only tell you that a Spyder can not be had in the corners being a mid-engine, and it weighs in at 2200 lbs, so it doesn't need much extra to get it moving with its stock 138 hp. Here's the spec link.
http://spyderchat.com/specifications.htm