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Old 10 Thumbs here did mine. It's relatively easy. LAGER99 posted some time ago detailed instructions with Pix. I just printed all and went out to the car. Took me 2 hrs but I installed a shift boot & e-brake handle also.
I like the sound of that, but I don't get your math. Can you explain that a bit? If it matters, mine is a manual.
Thanks.
Most M6's are starting with 330-338hp, did they do a dyno run before the mods to see where you started?
In trying to decide what mods I was going to go with I did a ton of research on this forum and most were getting 40 - 50hp from the mods you listed. (going from dyno graphs posted)
Headers 13-15hp, CAI 8 - 15hp, Tune 10- 20hp .. other's should be able to confirm these numbers..