First off, I would advise agains the Pro M 80mm Plastic MAF.
I had two of those crap POS.... The first one I bought in the beginning before the Supercharger believing it would make more power.. Well, it didn't and for some reason the calibration was off. I put the stock unit back on and it ran fine...
So I sold the Pro M on E-bay....
Then I got the Supercharger and was told that a Pro M would make a difference... So I ventured out and once again ordered a Pro M 80mm Plastic MAF.... Well this one was worse than the first. The Calibration was totally off and the tuner in Cincy couldn't make it work... I sent it back 3 times for recalibration and they never got it right... Even Jerry and the Fordchip guys couldn't tune in this 80mm Pro M... It seems Pro M in the beginning had some problems with the Calibration on Returnless Fuel System cars.. Well, I sold the Pro M once again and bought an 80mm Lightning MAF.. That was a lot better and it worked with my set up... The only thing when I got it dynotuned was that the Meter started to reach it's limit.... And Fordchip told me that I am about to Peg my meter and needed something better for my kind of HP... The 90mm would've flowed about 5% more air but that wasn't going to be enough.. I didn't want to spend a big chunk on another MAF so I checked on E-Bay and found a used Aluminum 77mm Pro M which was on a 99 Cobra... that was making over 500 HP... The guy only wanted 150 bucks for it shipped... Well, I told him my experience with PRO M and he agreed to send the unit to me and let me try it and if it didn't work to send it back to him. Well, this unit was much more precise and had better electronics and was a straight through design... It flowed a lot more air than the Plastic 80mm unit and Jerry was able to calibrate the EEC for this Pro M without a hitch.
He told me that his MAF will be all I ever need and my Meter pegging days were over...
My advise to you is.... Check E-bay for some 77mm or 87 mm Aluminum PRO M MAF's Don't buy the 80 mm Plastic POS units they sell. They might have improved but I would stay away from them... If and when you decide to buy one go with either the 77, 87 or the Pro M Univer models.... You can't go wrong with them.
Your Stock Unit is an 80mm MAF.. It is just a lot more restrictive than the Pro M or even the LMAF units... If you look into your stock MAF you will see a Post going all the way from top to bottom.... The LMAF's only have a very short post... The Aluminum 77 and 87 Pro M's have only a round sensor area and the Univer is a total Flow through and has no restrictions....
Since you really want to safe money at this stage... Just go ahead and use your Stock MAF... It will be okay up to about 350-360 HP... After that it will peg the meter and once it does that the EEC has to guess how much Fuel to deliver at a given Airflow...
And believe me you don't want the computer to guess with a Supercharger... A little too lean of a condition and your motor will be a doorstop... I have driven my car with the stock MAF for about a year and was making around 358 HP at the time... with my Automatic.. so you should be fine for now....
Now, don't expect miracles... Especially with the Stock gears and the Automatic. My Supercharged Stang behaved just like Stock until I got into the boost... but then watch out.... I never had any trouble beating my friend off the line or in the top end, however my friend with his stock GT and a 5 Speed always beat me on a 25mph roll on..... At least until I caught up to him... One reason is that your Automatic will not shift down to 1st gear after 20mph.. That is a safety feature because the rpms would rise a lot with the Supercharger in First..
This gives the 5 Speed an advantage over the Automatic... for about 1 or 2 seconds. Once the rpms catch up you will be all over him and pass him like he was standing still..... My advice.. Don't race from a Roll on.... Just from a dead stop and you should be okay
Now go out there and get that Dynotune.....
Tom in Indy
PS: No your car will not run with the Pro M calibrated for 30lbs injectors and your stock computer or any of the chips you have.
Since the chips and the stock computer are calibrated for your Stock MAF which is calibrated for 19lbs injectors... Don't worry about the MAF for now...
2.) If you can... put on the X or H pipe on prior to the tune.. It may not make that much of a difference but it may lean out your mixture just a tad which may be enough to cause some problems especially with a Supercharger... I would recommend the Magnaflow catted X-pipe... It is an excellent piece! I have the Bassani Catted X and my friend the Magnaflow X and his looks like a lot better quality and the fit was perfect.... To be honest the sound didn't change hardly at all when I put the Bassani X in there... The biggest difference came when I swapped to the Maganflow Cat Back with Magnapack Mufflers...
Also if you do have the X Pipe installed the tuner can turn off the Check engine lights you will trip... It will happen even with the Catted X pipes... They just flow a lot more air and the cats are less restrictive... A good tuner can turn the light off for that reason and eliminate the need for Mil eliminators...
3.) Why not sell those chips and get a Multi Flip Switch.. I am sure your tuner has one or can get one... That way you can have an agressive tune and a mild street tune all on one chip.. Then you can switch back and forth without always taking the EEC out and swapping chips...