Well, I've been basically talking to myself in this thread, LOL, but here's my review of the GM Stage kit....
My dealership only charged me $72 for the flash, which I thought was fantastic considering some were charging north of $100.
My first impression of the tune after leaving the dealership was "oh crap, did they upload the Regal T tune instead of the GS tune", because my car didn't feel any different...
I decided to log some parameters to verify the flash was even on the car... I logged MAF lbs/min first and after a short pull I logged 29.5 lbs/min. Stock the best I saw was 27.5-28 lbs/min. (Keep in mind, it was an 80 degree day, so it's probably closer to 30 lbs/min). Nice.
Then I ran a HP check, sure the gauge isn't 100% accurate, but it did show a difference... Stock I would see 294hp. With the Stage kit, I hit 317hp.
Last was a boost check.. I was reading 22.8-23 psi during pulls, but it was peaking much earlier than when it was stock, and holding it through the pull.
I still haven't been able to verify if they added any timing advance, as I haven't been able to really wind her out yet. I did see 10 degrees at WOT which I've hit stock a few times.
These test put my mind at ease at least... but I was a little disappointed that it wasn't a more noticeable difference in power. I wasn't expecting omg power, but 40lb/ft tq increase should be felt.
Well, I kid you not, but the next day, and the day after, the car felt stronger than ever (almost like the PCM was sorting out the new tune). Throttle is snappier, and the pull is def stronger and feels more peaky than the plateau feeling power curve of the stock tune. The tires actually chirped when the car shifted to 2nd. Never did that stock.
I must say I'm very happy with the performance from the tune and
intake. The car is a lot more fun to drive, and I love knowing its backed by warranty still.