Modified Power Wheels

[Jim M AKA Miatajim]

There's an entire forum devoted to making them go faster:
http://www.modifiedpowerwheels.com/forum/

And a whole mess of vids on YouTube showing how quick they can be made:

http://www.youtube.com/watch?v=E4vwOdn26Bk
http://www.youtube.com/watch?v=lZGiGtC832s
http://www.youtube.com/watch?v=K-u9RrTLjrU
http://www.youtube.com/watch?v=2yAf32g-Xxo
http://www.youtube.com/watch?v=VCFQPC5ANrU

[Bob Hill]

Definitely a cheaper hobby than real cars - not to mention how little space they require to store ;)