Its all a fix lol. They are obviously mates and doing it all to make a killing. I can't imagine Mayweather would have agreed to lose but think Mcgregor would to quadruple his worth
Could be a bad sign, piston rings on way out etc. I'd compression test it, if healthy consider getting rid of the filter and get a catch can or reinstate standard breather
Really simple and doesn't have to cost anywhere near that. Get some welding cable and run it to the rear. Use the rest to make an earth to a good metal point in the boot.