There may not be any gain in HP.
All the air has to enter the engine through the throttle body. I would think that if you calculated the area of the ‘face’ of the throttle body, as long as the area of the spike air intake openings is equal to that or larger than that, you are not starving the engine for air, so no power is lost.
At that point you could put 10 intakes on the bike, the limiting factor would be the smaller throttle body. Adding 10 intakes will not add more HP in that case.
Now if the single spike has less ‘area’ to take in air than the throttle body, then you should see an improvement with a second intake, but only up to the ‘area’ of the throttle body.
Even if you do see an improvement, I don’t see it being more than a few HP.
Looking at the area of the openings for air flow on my spike (D&M Twister) I can tell that the area of the openings is way larger than the area of the ‘face’ of the intake pipe (which is about the size of the throttle body).
IMO (just eyeballing areas/sizes) a single spike does not starve the engine of air, and adding a second will look very cool, but not increase HP.
Or I’m nuts.
Either way.
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