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At this point with how much the user group of BM3 has grown recently, I’d say Bootmod3 > JB4. Although if you want a custom tune I’d highly suggest DME Tuning as that’s what I’ve got on mine with no complaints. 650whp is easily achievable although clutches usually start slipping at any more power than that - traction can also be an issue depending on your tires. You’d need to be catless in order to get the most gains out of your M6. I’m not expert but hope I was able to help you out a little
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