Originally posted by camarojoe
The stock MAF sensor is good to arond 450hp once the screens are removed. It flows around 658cfm with the screens out, that's about the max a 350 can swallow at 100% eff. at around 6000rpms. Somebody correct me if I'm wrong, I don't know the exact #'s.

However, for a few bucks more they do offer a Wells Gold and the Conrad line that are more of a premium quality. Among these parts is the SU-145 MAF. This is a direct replacement for the Bosch analog MAF on many of our cars ('86-'89) but shares many of the features of the LT1-style MAF, such as a thick film sensor instead of a hot wire, no heat sink, larger I.D. housing, and a single flat metal matrix on the inlet instead of the round wire screens as found in the Bosch units. Flow is improved and the survivability of the sensor is nearly thermonuclear-resistant. I have heard from some that the MAF does not mount well in situations where the OEM clamp had been screwed to the MAF housing, but most installations are identical to the original.

Since many have asked where to get one, the factory replied:

"We suggest contacting Neil at World Discounts @ 800-288-6728 or Chris at Ace Warehouse @ 605-342-4710 to purchase any Wells products. If they do not stock an item they will be willing to special order it and will drop ship orders directly to your business or residence."

That's almost correct. If you place teh two units side-by-each on the bench and throw the calipers at them, the Wells unit is 3mm larger in the small direction, and about 8mm larger in the long direction (it has a little bit of elliptical shape in the housing). If you talk with the engineers at Wells, they won't tell you that it flows more at the same pressure differential, since they designed it as a direct drop-in replacement. The flow test on a bench tells otherwise. Unfortunately, the bench I used to have access to was only calibrated to 700 SCFM, and the Wells unit didn't hit the 0.1" SP at that flow level, whereas the stock Bosch unit (complete with dead hot wire) flowed to about 580 SCFM at 0.1" WC/SP. The sad part is, as you say, the ECM firmware limit is 255g/S, and tuning is the best way around that.