yeah, theres no point doing just one or two things as you wont benefit from it. One mod leads to another. So if you were to say make it breath better with an air filter, and put a camshaft in, then you would need to get a 4branch and a system to get rid of all the extra gasses. And theres a lot of money. Like what rhys said, put a 16valver in there, they're cheap to come by now, 130bhp standard and its a much more tuneable engine the the 8v.