i had to change springs retainers and locks on my 3k indy heads. and i had to change them on my stealth heads most of the time when you are building something you will end up with a little extra. the stealth heads look great and perform fantastic for the cost are there better heads, absolutely. is there a better head for the money NO

nitrous is like a really hot chick with an std you want to hit it but youre affraid of the outcome.