Originally Posted by No1Piranha

All factory forced induction cars are faster after modifying the ECU mapping. They're all tuned at the factory to minimize warranty claims, so just leaning out the A/F a bit gets you 20 whp. That's not going to be mind-blowing max performance difference, but the midrange improvement is typically noticeable.

Just my 2 cents but it's really tough to justify any ECU re-map costing more than $1k. If the tuner really has experience with the car, even a custom tune is nothing more than 15 minutes on the dyno followed by another 40 minutes ridding shotgun while working the laptop. If the tuner doesn't have the experience with the car and its ECO paramters, it's all a trial and error exercise and you're basically paying to school him in what works and what doesn't work. By comparison, $800-900 on my Evo gets a piggy-back ECU set-up that enables you to switch between a few different maps (e.g., one for factory tune, one for 19 lbs boost on 91 octane, one for 21 lbs boost on 93/94 octane).