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Message: <blockquote data-quote="mybmmer318" data-source="post: 9632" data-attributes="member: 3149"><p>Hi guys.Anyone using this set up now? A M50B25 engine with a a m3 manual 3 litre gearbox? If using the m3 gearbox do i have to replaced the drive shaft and rear differential too??Currently driving a 318is manual but intend to swop out the M42B18 to a M50B25. Hers a few setup that i have in mind: Option1.M50B25 engine with Manual M3 3litre gearbox. Option2.M50B25 engine with my current manual M42 gearbox. Option3.S50M30(M3) engine with Manual M3 3 litre gearbox. For Option1: do i have to replace my current long shaft and rear differential? For Option2: i have read that this set up i can still use back my orginal gearbox, ecu, drive shaft and differential?? Correct me if i am wrong. For Option3: I know quite diffcult to find but still possible but can be very costly. i already have lobang to secure the S50 manual gearbox and rear differential and i need advices whether which set up will be the most effective in terms of cost and power output as i understand changing into a M3 engine is not as simple as putting it in.If Option 2 is affordable and not so complicated with increase in power i will ditch the m3 gearbox and rear differential idea and concentrate on looking for a B25 then.Many help appreciated. Thanks for reading</p></blockquote><p></p>