I'm not sure. Every car seems to respond a little different. A number of people have mentioned that both the Cobb and JB4 tend to surge a bit when the boost dials up. Some people claim that they don't experience any surge. That being said, the stage 2 Dinan and GIAC tunes seem to get the best reviews when it comes to smooth power delivery but they are not cheap and require a dealer to flash the ECU.
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