I have some questions that you may be able to help me out with. Last year I had a 06 RM-Z450 and I had a I-cat installed and this bike started so easy but I am not sure if the I-cat was the reason so my questions are. 1)How easy is the 07 on starting? Do I need an I-cat? 2)I weigh 175 to 180 pounds, Do I need to change the springs on the front and rear? 3)What about sub tanks for the front forks?