All air cleaners restrict, and some restrict more than others. K&Ns *do*
restrict less than the standard filters, and the needles were originally
chosen to balance the level of restriction of the original filters through
the throttle range. Do anything to improve the breathing, and filter type
is just one of those, and you may well have to change the needle profile to
restore the balance. Ironically ram-pipes may make things *worse* by
smoothing the air-flow, other engines have design features to *cause*
turbulence to ensure proper mixing and distribution through the cylinder.
If you have to change the filters, then try a richer needle, there are lots
to choose from and various programs that compare them graphically. But like
many so-called improvements to the MGB any change is only likely to be
detectable at the limit.
PaulH.
----- Original Message -----
> I'msorry, but this statement just doesn't make sense. If the stock air
> cleaners are "restricting" the air flow at idle, why aren't they choking
> it
> off completely at open throttle?
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