Wow a car payment and a loan to mod another car? Fast track to credit counselling.
Look at the long term cost of what you are doing, sounds like a massive anchor of debt. How depressing.
2013 WRX, 5 year cost of ownership: $42,041
2013 Subaru Impreza WRX Cost of Ownership
$25 bucks a day weather you drive it or it sits in the garage. Ouch.