I thought I would start a thread of outstanding Websites for Information on Cars and also Technical Information and/or Parts Suppliers/Manufacturers. Sometimes it's hard to find the information you are after on the web. I hope this thread helps to find your automotive and information needs.
I hope this thread only gets posts of links and descriptions as it will be a good resource for everyone to find out information quickly.
Please try to post only one link per posting.
I'll start the ball rolling with a few of my favorite websites:
I found for converting just about every type units, such as hp-kW and ftlb-Nm etc.
Unit Conversion Calculators