After winter i plan on having the parts listed in my sig installed (they're sitting in my room), I am guessing I will have trouble getting traction at the track. What is the best suspension mods to get first? by the way I plan on getting QA1 coilovers for the front and lowering the back to match the front...

 

12 Bolt rear end with some drag slicks first.

 

how much would a 12 bolt cost??