I just recently bought a Diablo Predator Tuner, and I was wonder if anyone had an experience with how much power they actually add, and if 'driveability' is also better.
Also with that and the mods in my sig, what should be my next add-on ?
I would estimate you should gain about 8HP and around the same in TQ if you get in dialed in on a dyno. I'm not sure what the initial gain would be with just the basic tune with your mods, but after being dialed in, that's about what you should gain. I gained 13HP and 12TQ after being dialed in on the dyno.
id say that its worth it. your next mod should deffinetely be gears. and when you upgrade your gears you need to recalibrate your spedometer which the tuner will do for you so thats a major plus. also you can set up differnt things like having your traction control set to "off" when you turn the car on so that you dont have to manually shut it off all the time. id say its worth it for sure.