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Hi all, Jimmy from Auckland here and I have never owned a BMW. I really like the design of the F06/F13 6 series but I don't know whether I should buy a 640i or go for the more powerful 650i. I would prefer to get the more powerful one but not at the cost of reliability. My brother has a N54 335i Coupe and I believe he's at stage 2 with a upgraded charge pipe, catless down pipe and a upgraded intercooler. I have no idea with how much HP he's at, but would like to achieve similar HP if I were to buy one. From what I've read online, it seems like the N63 engine in the 50i models are complete nightmares. Is this true for the updated N63TU/N63B44O1 from 2013 onwards as well? Or are they better? I don't plan on tuning the car if I get the 650i, but if I get the 640i, I do want to get a upgraded charge pipe and go stage 1 but I doubt going stage 2. Is there a big noticeable difference between stage 1 and stage 2? So with reliability in mind, should I go for a stock 650i or go for the 640i and go stage 1? Also is the mechanical insurance worth buying? Will the stage 1 tune void it? I will not be taking the car for tracking.
