Digital Tuning Question for you folks at Steeda

I want to upgrade my intake on my '13 Mustang RTR, it's running a Ford Racing Tune (Part code M-9603-MGTB on Ford Racing's website.) and has a K&N drop in filter currently installed, and an Magnaflow axleback exhaust. I like the tune, it's nice and torquey, and Ford claims the tune will put you around 445 bhp/450 ft lbs of tq, but I want to increase what I'm making.

So my question is, given that I now have a map of this tune already, can you build off of it if I get the Steeda high flow intake and increase my numbers? If so - would the tune cost the full 300 some odd dollars still, and, what other information would you need to get the tune as efficient as possible? (Tire size/Differential ratio etc).

I've been a past customer of Steeda, the parts are awesome, hoping you can help me out.


EDIT: http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=12346

There's a link to the tune applied to my ECU.

I love my exhaust, it's quiet but still aggressive at idle and it's nice and throaty when I get up on it. What number plate is yours?

And yeah as far as the warranty is concerned I thought about that, which is why I got Ford to send me the map of the old tune and the tuner with it. I just want to see if Steeda can build off of that map and make it better. If I ever have to take in the vehicle, I'd just reflash the ECU with that Ford tune and bam I'm safe.