I personally didn't notice any change in performance. I thought my car was running very well before the tune and didn't think they would get much out of it. My car dyno'd (with mods) at 300 rwhp before the tune and 306 rwhp after. But now I know everything has been optimized.
The strange thing I did notice was my exhaust note changed... I thought it was just me but the first time my wife got in the car after I got the tune done she said something about the exhaust note as well. I didn't even tell her I noticed a difference until she said something. I don't know why a tune would change the exhaust note...
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