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all the numbers are close... but it depends on if you are looking at overall numbers, or just spikes...
the header has alot of power up high.... same with the intake and exh... lowend tends to suffer a li'l bit with mods on a 4cyl car....
but figure an honest 4-8 from an intake
2-6 from exh
and a really honest 1-4 from a header
these are sort of homologation numbers i've seen from scc and super street mags..
all of these can, of course have a ten hp spike in there... but it may be at like 7k rpm... most of us dont drive there all the time...
look for what gives most power in mid to low, b/c regardless of what people say, that is where the motor spins the most....
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