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Originally Posted by Lil bastard
Topless- agreed...but to add, unless you also swap injectors and tweek the software to take advantage of the increased flow, you'll get next to nothing in terms of more power.
Also, FYI, a smooth bore on the intake (whatever the diameter) is NOT the way to go!
In F1 testing, they've found that a 'rough' (or cross-hatched) intake ID creates much smoother flow than the traditional 'polished' intake - a boundary layer of turbulent flow at the surface provides much smoother flow to the bulk of the intake charge.
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Yep,
That boundary layer creates laminar flow in the intake. This slightly roughened surface improves automotive engine intakes, jet engine intakes, and racing yacht hulls and foils.