I have c6 zo6 rims on my car. 18's in the rear and 17's in the front. What should i get to lower my car. It has stock shocks and springs the car is 7 years old with just over 100,000 miles on it. Please tell me what the best spring and or shock combination is and where should i buy them? Also one more question can I install them myself? Also will i have to buy shocks if I lower it? thanks for all the help guys~Chris