The tune itself makes a decent difference from stock (as my dyno and butt and personal experience has shown). However, I know for a fact that headers will be yet another step up the ladder
If CA emissions wasn't a pain in the ass, I would've had headers installed already, and have JSW give me AA's retune for headers
We'll see. I just might cave in, sometime in the future.. Performance-wise, I've only got a B&M drop-in filter, along with SS Race muffler cans. This is enough power from the motor for me personally. But am looking into more aggressive gearing; perhaps the 4.10 , or at least the 3.91 =]