Originally Posted by caballo

4.10s.

I have a 2k GT 4R70W as well. It will DEFINITELY wake up your ride. The only "downside" is your cruise rpm go up a "lot" at 55 I'm tachin' 2k at 65 2.5k at 75 2.75k. I don't really care, I love 'em.

I've also got SLP LM1 CatBack and it's not really that loud or drony at cruise in my opinion. I can listen to the radio or hold a conversation with no problem.

Gears and install kit will run around 200-300 and install will vary between 200-400. So you're looking at a good investment.

I would also recommend your preferred tuner for speedometer calibration and transmission performance.
SCT/ Diablosport/ etc... which will run around 350 depending on where ya get it. (I have Diablosport)

Also, if you're mechanically inclined, I would recommend the "Jmod" and a tranny cooler, which happens to be my next project.

with those three mods you'll definitely feel the difference in your auto and be very pleased.