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Originally Posted by mirob
I don't think BMS makes a JB4 for the N63/S63. I have the Stage 1 on mine and I think that's as far as it goes.
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They do make JB4 for the N63. It is a popular tuning solution on the F10 5 series. I know someone who has it on his 50i and is pretty happy with it but I don't have any first hand experience.
OP- if you are eventually going catless why don't you look at doing a flash tune through Velos or AA? Omar at Velos provided me with a tune when I went catless and I am very happy with it. Just a suggestion.