i was just looking at the allen kits for these cars , and i was just curious to know what the deal is with them , ovbiously you will see a gain in power , but i was more conserned with how save it is for the cars and if it puts too much stress on the engine , bc its alot of money to spend and then blow something up can somone help me out a little bc i would like to do something like this to my bird if its worth it thanks