Max BHP on standard airbox
 

Simple question by using a standard airbox and uprated panel filter (k&n,green etc) what would be the max bhp you could get?

The Type 25 uses the original airbox and that pushes out 400+bhp.

On a classic the standard airbox is ok up to 350hp.... plus it keeps the inlet temps relativly cooler compared to an open cone type filter as its sealed from the engine bay heat to a degree.......