no but seriously i was in your boat one time... no cam gears unless you plan on getting cams or nitrous anytime soon.. thats mainly the only thing you will need to change your timing for... intake mani comes absolutely LAST, that is for keeping the horse power up at a super-high rpm, which no offence but im guessing your car isnt there yet... if you are looking for some kinda noticable differance i would say if you have intake and exhuast get some headers and by-pass the cat... thats when you make some decent powergains for cheap on those bull shit 420A motors
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almost dumped 07 SI