[DanG]

Correction- A Contour/Cougar MAF is a Contour/Cougar MAF, SVT or no. There is a difference between return-style (metal) and returnless (plastic) MAFs- Something in the calibration code.

Those of us (like me with my old Cougar) used SVT Lightning MAFs for the simple reason that the stock MAF can only measure a certain volume of air- Beyond that, the MAF voltage pegs at 5V (4.6?) and the ECU can no longer compute the correct injector pulse width. So, for F/I cars above a certain horsepower rating (>300?), you need not only a larger MAF, but the correct calibration tables for that MAF (hence my use of the SVT Lightning MAF, as my tuner had the correct tables for it).