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I can say first hand that (excluding a Protune) JB4 + back end flash >> Cobb OTS maps. I had Stage 2+ OTS map which was nice. Took everything off then decided to give the JB4 + Burger back end flash (through my Cobb AP)... with just that tune alone, it was about as fast as stage 2. I have no Dyno info to back it up but I'd be willing to bet that JB4 Map 5 with E40 + the back end flash would be as fast as S2+ ots map.
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