Of course the bigger engine like Gussie says at LEAST 280hp!! And the factory dual exhaust... I think the S/C or turbo would have been too much if they had given it 280hp already... but............

About 6" longer in wheelbase and/or interior/body (Ldub, no sickie penile inuendo ).

And a backseat halfsize, suicide style door, would have been cool to put it on driver side only. Oh, and the back door should have been a hatch style lifting up instead of sidewise... I know it probably would have been a big problem with the spare tire there... but figure it out and make it so... an inside release for the backdoor, with a button on the remote for it also.

That's all I can think of right now, but I'll be back as the idea's keep coming.