SRT 10 Vipers are alot more refined than the Gen I or Gen II body style. As far as being cramped, I fit in them great, If you are over 6"2 they make a seat lowering kit for 1" so you have more head room. The only reason the car would grab would be if the camber/caster/tow is off or if the tires are worn. When the tires on the Vipers get lower than 6/32nd's new is 11/32nd's they will definetly pull on any grooves on the road, I would check the tire tread depth.
I am the largest reseller of Dodge Vipers in North America and would be happy to help you in your quest or if you have any questions that Shelby can't answer feel free to call 1-800-270-1608