1. Have you/did you mount this battery in your Boxster? If so, did you make your own mount or did you have to buy a special mount for the battery
Boxster586, you can buy mounts online, but I have made my own mount of of just plain old wood and a dremel. No need to drill the battery pan/tray, but you should remove it if you decide to make your own mount.
2. What's the difference between this battery and a 15 lb. 12 volt garden tractor battery that puts out 350 cca ( I have one sitting around or if I need to, I can get a new one for $30)? Keep in mind it's just used for track day only.
None really. I have a ETX20L 15lb motorcycle battery powering my boxster. No problems, just don't mount it on it's side, or issues will occur.
I also don't have the radio code for my car and the closest Porsche service center is 200 miles away. This is the other reason that I I asked about the Wal-mart tool.
Porsche Resetting Radio Codes
Thank me later.
Note that Braille batteries and Deka batteries are the same exact thing. They are just rebadged with different stickers.
I installed this just last week with no problems:
Big Crank ETX20L Battery - Free Shipping: BatteryMart.com
I don't work for batterymart, but their prices are pretty good. You can also find the same battery from autozone.
You will, however, need adapters, which can easily be found online for $10.