Re:1.5 non Vtec in the 10's Whats with that.?
 

yes the Longer the runners are the better in some cases.

the CHEAP off the shelf you buy from some parts place or order of the Net that are So called Name brand.

those are not designed for High RPM REV
those are set up for either to build more lower to mid-rageed power or upper Rpm Power WITH IN THE STOCK ECU RPM RANGE. now you can make more if you adjust for the fuel and spark curve. another note there also that way so they bolt in easly... its is well known fact that most people that work on there cars and don't do it professionaly Can be Numbskulls. ( hence ease of installtion. )

if some one handed that Pretzle for a Header i bet there would hundreds of calls asking what am i suppose to do with the extra pipe..how do i put it in???( like putting in a light buld it isn't that hard )

no to the Why its so important to have equal length runners that have Wide bends ( this why its so long ) becuase tight bends are bad.
there is particular harmonic frequncy that the exhuast makes
in this as the valves open and close they make Pulse's those pulse either slow down ( less power ) or stay the same speed until merged ( this is good ) or speed up due to restriction ( only good at low end bad at top end )
the tighter the bends the more inconsitant the pulse will be either speeding up or slowing down..
image 4 gears to make gears work they must align the more alignment that better they work.
thuse getting the pulse to align at the collecter makes for consitant speed and this inturn allows maxmimum efficiency.
and produces maximized hp through out a specific rpm range..

next here is the tricky part
your primarys the first part of pipe that comes out of the Flange of your Header. is such a Diameter to either Provide restriction or is open enough to breath more..
smaller primarys good for low to mid range operation
Larger primarys good for High mid range to Upper High rev range.. talking 4,500rpm to 15,000rpm range
dpending the application

and the part is why they so curvy becuase you got to put all those wides bends some where..





there is particular science for this.
i don't know enough about it..
but i know a good designed header when i see it.. ;D

falkhen