Hey im wanting to start really modding on my 99 2.4 i was interested in the secret cam swap and ho manifold any info on those parts and how hard it would be to install right now all i have is aftermarket exhost from header and a k&n square filter i was suprised on how much the filter did lol my old one was in bad shape.The motor has about 120,000 on it and its been well taken care of all oil changes met and mid grade fuel used (not sure if that makes a difrence in engine quality but it makes me feel better lol...)
a search for the the HO manifold would help you. and reading the FAQ/sticky about secret cams at the top of this forum would also help you.

Im a Xbox 360 fanboy...and damn proud of it!!