I'm wanting to get 7 inches of lift out of the front of my k5. right now i have a 4 inch spring. and i want to keep the stock length springs in it. I wanted to try and stay away from a 6 inch spring, with the ord zero rate. so i was thinking 4 inch spring, 1 inch zero rate, and ??? whats the best way of getting another two inches? or should i just get the 6 inch spring?