if you had to separate each individual engine part, and give a % value to it, in terms of how much power it gives the engine as a whole, what figures would you give them? for instance:

intake: x%
intake manifold: x%
valve springs: x%
camshaft: x%
cam gears: x%
spark plugs: x%
pistons: x%
other electronics: x%
headers: x%
exhaust: x%

we're assuming N/A, and that our car has 100 bhp. how much would eaach part contribute to the overall hp of the engine?