Two part question
 

Are 4:10s to tall for a super charger.Also some good advice on using my diablo on another mustang 4.6 2v it has all slp pipes ltubes cats and xpipe put on underdrives cai also has 4:10s and rare these days 15 inch welds been lowered 1.1/2 inches.what should i do in tuning to gain most hp possible

Welcome, are you running an auto or 5 speed? I think with the 2v you'll be fine with the 4.10s. I think most guys run 3.73s w/auto and s/c and 4.10s w/5 speed and s/c.

You can only use the Diablo on one car at a time. You have to put the factory tune back in the car before you can use it on another. I use the Diablo for my 02 GT and used the installed tune on the programmer. I feel safe with that and have had no problems with the tune. Stay with the good gas. (A MUST) I would not start changing parameters because you could do major damage.

With the mods you have now I would not worry about a custom tune at this time, as you add more upgrades later a custom tune will be a must.:t:

The car is manual trans bought to tuners so each car has its own,thanks for the advice

Where are you at, Northern Va.?

Im down in Fredericksburg you know any good shops around

Go to Steen Racing for your tuning needs.