I have used the Evilution site, and dealt with Kane, the genius behind it, many times

. If there is ever anything not quite right with my Roadster I know that answer will be on Evilution. Not that much goes wrong on mine

! Kane and his friends seem to spend most of their lives taking their cars apart and photographing it for the benefit of the Smart community.
I hope for all of you USA Smarties that the 451 is as modable as the UK ones. I have done a few bits to my Roadster and it just more fun each time I play with it. Having Evilution online to remind me how to put it back together again is fantastic.
One sobering point though, if you do use Evilution then I suggest that you PayPal Kane some money to help him keep it going