Im just wondering what the benefits of having a tuner are on a stock 99 v6 with just a CAI
The benefits of a tuner are that they remap your fuel/air mixture tables in the ECU and/or change the spark plug timing to either give you better efficiency (mpg) or power. The default tables that come from Ford are made to support lower octane gas and fuel efficiency, with little help for performance. The factory timing is for efficiency.
So, a tuner will remap the fuel/air tables and advance timing for a specific octane gas (higher octane has more potential for power) - estimates are ~15hp. It can also have another tune for lower octane gas that will refine the fuel/air maps for better efficiency - est. 2 mpg gain.
From there, tuners can work with other mods: adjust your speedo for different tires (new wheels) or gears (new final gear ratio), remove your speed limiter, clear EGR or O2 sensor errors (new exhaust), change the shift pressure for auto trannys (faster shifts), change the shift points for autos (since you have faster shifts, you can actually shift at a little higher rpm without going over redline), control fans, etc.
SCT & Dialbosport are both good. Like somebody suggested, check with your local tuner (or big players like Tillman's, Brenspeed, etc) to see which they use and go with that.
FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver POWER
: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage) STYLE
: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs RIMS
: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear TIRES
: BFG KDW/2 245/40R18 front, 275/35R18 rear