cheap mafs at vortech

[7up]

I have been looking into getting a mass air, either a 73mm or a 76mm. I noticed Vortech is selling the 73mm for $120 while other places are selling for around $150. They also sell the 80mm for $142 while others sell it for around $200. I was thinking about getting the 76mm, but Vortech does not sell it. Jd's performance sells it for $205 and they sell the 80mm for $200.

I am wondering why Vortech is so much cheaper on the MAF's they sell and why the 76mm is more expensive than the 80mm? Also is there any drawback to getting a bigger MAF such as the 80mm compared the 76mm?

Right now I have a vortech a-trim(5 psi) and Flowmaster catback. I plan on getting 30lb injectors and a 255 fuel pump along with the Maf. Any help would be appreciated.