Yes it can be used with stock valve springs, but u need to keep the rev-limit stock. The cam doesnt overwhealm the turbo. It will make power, easier, and cleaner. Definate gains above the vtec line, thats for sure. You can err on the side of caution and also install upgraded valve springs without removing the head. Just take it to someone experienced in honda's.
Water/meth injectioon is definatly legal. And we are talking 10-20kw on an aussie dyno. Its like running race gas, but costs less and is less volotile.



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