Use a blow through. If you put the MAF before the turbo(s), you will have to use a physically larger MAF because you will only be able to generate about a 15 lb in (sq) pressure drop with one end open to atmospheric pressure. Placed after the turbo, you can generate a larger pressure diff and you will flow compressed (forced) air through the MAF. Forcing air through the MAF allows you to use one that is physically smaller.
Blow through MAFs are calibrated differently and are machined (in some caese) so it won't disrupt laminar flow.
Last edited by MitchB; 04-27-2003 at 03:11 PM.