Hey Nick, not to get into another pissing match. Think of it this way, all manufactures don't tune their cars to be at their peak. They want certain fuel mileage to be reached, and to be within limits for longevity of the parts and the motor. Performance means you want all you can get out of the car within safe limits. Eurocharged, or any tuner for that matter will take the car to it's peak performance parameters. That's all. It will be within it safe range of operation, but a the peak. You won't over rev, and your mileage might suffer a little, but in some cases, just the opposite happens. You will see a difference. Question is, is it worth $300 or so to you?