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Originally Posted by SSSnakeman
To clear up my comment. IMO those stock parts are insufficient for JB4 and Cobb tunes. Other opinions will differ.
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What are you basing your opinion on?
Cobb has Drive, Sport, and Aggressive, all which at least from their advise do not absolutely require any mods. They only say Aggressive requires 93 octane and "recommend" a catback on the newer beta maps. I think JB is somewhat similar with map selection.
I can't speak much for JB's process, but Cobb builds their tunes on their own dynos with the modification list they put on each map. They're not just shooting from the hip or winging it.