Cobalt Addiction has assembled its own stage kits so you can do the upgrades necessary all at one time for a dramatic boost in performance. No more having to sort through all the gadgets sold and guess if they all work well together. We have done the research for you . We will have dyno printouts posted soon on each kit . These are tried and true kits for both street and racing . Start small or go big right off the bat !!! We have all the parts needed in each kit (Installation tools sold seperately ). All kits require the PCM reflash. You must send us your stock ecu and we will reprogram it to the correct stage you're running. Anything from a stage 3 on we recommend cold air intake , Full exhaust , and tuning gauges all sold seperately.