lilonespaz
Drag Race Newbie
x2 for Cobb/Stratified
lilonespaz will be in here sooner or later, he can probably explain better.
Basically, he is saying a Unitronic tune will be smoother/more drive-able than your current APR tune. Unitronic is a flash tuner, similar to how your car was flashed by APR.
You can buy a Cobb AP, which will be married to your car and comes with Cobb's OTS tunes, which are very mild.
You can go an extra step and get an E-tune through Stratified. You either buy a "covers-all" tune which will cover basic mods (intake, dp, dv, etc.), or you can buy a pro-tune through them, which will be tailored to your car and mods. You let them know what your mods are, and what you're looking to get out of the tune. They will send you an initial pro-tune. You will have to do some work and data-log with the Cobb AP. You send them your data-logs, they review and make adjustments. This is a back and forth until you are happy with you tune.
Bonus info: Buying a COBB from Stratified means you get their OTS map for free with a MAF calibration revision.
This sums it up pretty well. Read through the stratified thread for more info.