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I have both Jb4 and Cobb, I can say I was less worried installing the Jb4 than I was with flashing the Cobb file. I was locked inside my car, unable to open the door for about 30mins as the Cobb AP backed up my ecu and flashed the new file. I was so worried about moving the damn Cobb AP that if it disconnected or something I could brick my ECU.
anyhow, if you want power get JB4, if your a brand whore get cobb.
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