I'm a member of several automotive forums.
Super Coupe Club of America ,
TCCoA.com - Thunderbird & Cougar Club of America ,
Modular Depot - Your source for Modular Performance parts and service - Modular Depot - Your source for Modular Performance parts and service ,
The Corral - Home just to name a few, and my SN comes from the fact that my project car is a 1991 Mercury Cougar (cat) and it has a 351 Cubic Inch Small Block Ford V8 under the hood

so, 351cat. It's also really easy to remember
I'm totally a gear head and i cant wait to destroy, er.... i mean improve on my first moto bicycle when i get the kit.
