Lightning 90mm MAF vs 03/04 90mm MAF?

[REX-RACER]

What's the difference between a 90mm Lightning MAF and a 90mm 03/04 MAF? Don Lasota is setting up an E85 tune for me and when I told him I had a 90mm MAF he needed to know which one I had. I didn't even know they were different?

Is the MAF transfer function different? Would one work better than the other w/ 42 lbs EV1 injectors and a Stieg ported intake w/ JLT CAI & 62mm tb?

 

[GloomySVT]

I believe the lightning MAF does not have an integrated IAT sensor.

 

[01yellercobra]

Size wise they're the same. It probably had to do with the value files he needed to load up.

 

[03Steve]

They are extremely close transfer function wise. Off the top of my head, their factory calibrations peak within 1-2 lb/min of each other.