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I had an N54 135 stock with Procede V4. The N54 is definitely faster but the N55 Cobb is more responsive on low rpm.
N55 Cobb compared to N55 stock is very noticeable. I didn't play with it much though today, I live in Seattle and it's been raining like crazy!
The upgrade was smooth. Make sure to hook the AP to your PC and update it before connecting it to the car. The installation was very easy.
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