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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