[Netputty]

Anyone have any experience with a JB4 on top of the tune that comes with the M Performance Package? I'm not sure how the mapping differs from the stock one beyond the HP/torque numbers, and I don't want to move to the JB4's map #2 and find that the +6 pounds of boost are too much for the combo.

Or do I have it completely wrong and the maps don't stack?

Thanks!

[Mike_L]

What did that package consist of? I’ve never heard of it on the N63, just the turbo 6s.

[Netputty]

It was a +40HP/+50Torque map and a throatier, higher flow exhaust.