I would suggest taking a look at the tuning section here. Lots of information and feedback from folks who have done tunes. I use the VF Engineering stage 1 tune and have had good results, not off the chart performance but the car is otherwise stock. You really need to define your goals, no one size fits all. Many require a downpipe and upgraded intercooler so take a look at the tuning section and most likely you will find someone with similar goals that can give you an idea of what direction to go in.
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