I'm possibly wanting to try and extracted a few more horses from my zed . I would love to supercharge it but at £11k + it's a lot of dosh , yes I know you get like 450-500bhp but still it's a lot of money . What can be done with say 5k ? Cams? Head work , pistons , And what sort of gains could I expect? Is getting 370 at the fly achievable ? This is on a HR zed .