Holy bftd! Been running one for almost four years now and all good. I just put it on over my existing cam sprockets too but keep in mind my engine did not have a lot of miles on it when I did this so if yours does i'd recommend a sprocket change as well.

If you put a new chain on worn sprockets the chain will stretch almost immediately and render this upgrade practically useless. As a quick reference check, if your stock chain is loose then change the sprockets, if its tight then you should be okay to just drop on the chain and go.