I jumped in with both feet and installed Brenspeed's 93 octane X-Cal2 tune straight up with the addition of my C&L Racer CAI kit.
It has been a week and I am still trying to re-learn how to drive this thing. It is now a whole new animal.
Luckilly, gas prices came down a bit recently but I think I'd pay the price anyway just for the fun factor!
2006 Legend Lime Mustang GT/Manual Trans
/some mods(tired of updating) 13.257 @ 109.36 on stock 18 fanblades and stock BGFs wth CAI, tune, UDPs
1967 Lime Gold Galaxie 500 XL/390 4bbl/Toploader
1966 Mustang Coupe/bare metal (rebuild in process-slowly)/engine&trans