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I never experienced any issues with the JB+, Stage 1 or Stage 2 for my N55, I drove it for over a year with DP, perf. exhaust... I just put the Beta on the 550, so too soon to say much... literally only been 3 days. The car definitely accelerates harder, but nothing like the N55... (much lighter car and the torque increase there was crazy).
As for #4... Terry has sold approximately 50 of the Beta tunes. He said he would start looking at a new stage when he sells about 250 of the Betas... it's in the thread on their forums. wouldn't expect it to happen in the near future.
Rich
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Rich B.
2015 M4 | Alpine White
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