Check this out.

http://emachineshop.com/

Might have been posted a long time ago but...
You can design and machine your own parts! It is expensive, but you can customize everything....just for grins.

wow, if i had some $$$ i would use it.

thats awsome i wanna get a new custom spark plug cover

spark plug cover easy to find nice ones i want a valve cover only one i found was one by moroso. that sound pretty sweet might have to check that out

Thats cool,