I've got the Brenspeed tunes. Haven't tried the 87 tune yet but have used the 91 and the 93 and am very pleased. I have a manual tranny. Car seems pretty normal when you drive it passively, but lots of extra juice once you hit about 3,500+ rpm. You can actually feel it kicking in at that point.
I must say that I have not noticed an increase in mileage. If anything my highway milage may be down a bit.
Would like to try the Bama tunes but apparently you can't keep more than 3 tunes plus stock tune on the SCT tuner at any one time.
2008 Vapor GT Premium Convertible
5 spd, IUP, 18" wheels, 14" shorty antenna, some interior dress up mods. FRPP CAI, GTA mufflers.