Jimmy9877 0 Report post Posted June 8, 2022 (edited) 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. Edited June 8, 2022 by Jimmy9877 Quote Share this post Link to post Share on other sites
balancerider 758 Report post Posted June 8, 2022 The Pre facelift 650i (small wheel on idrive is easiest way to tell) with the pre-TU n63 is likely to be a money pit. The N63TU is allegedly better but an N55 640i, even in Stage 1 tune is likely to be more reliable. Nice looking cars though Quote Share this post Link to post Share on other sites
