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I had my C6 tuned at a shop here in Florida. This was a full $500 dyno tune. I was stock except for the addition of NGK plugs. The Dyno tune got me a whopping 7 hp. I really didn't notice the extra power. What defiantely made a difference was having torque management removed. You will notice this especially if you have an a4. The downside is shorter tranny life, but the question is how much shorter.
There was a slight improvement in gas mileage though. It was slight, maybe 5%.
My recommendation would be to save the money from the tune and do it once you've modded the car so that it takes full advantage of the mods. Either that or find a place that will re-tune after you mod for a lower price. You will need to have it done again after mods.
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