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Message: <blockquote data-quote="ersalle" data-source="post: 499850" data-attributes="member: 363">Correction! M50 got no B28, its M52 that has B28. If you upgrading from M50B20 to M52B28, you will need engine complete including wiring harness, ECU etc. Its good to go for full half cut where you can get all the necessary items. And take note also that gearbox (be it manual or automatic)from M50B20/M50B25/M52B25 cannot be used on M52B28 engine(due to huge power difference).Another better way you can do is get the M50B25 engine, top end hp almost same as m52B28 only lower torque(only moving off not as quick as M52B28). This one is straight swap, all u need is the engine complete including ECU. Your old gearbox maybe can be used back(this one i'm not very sure).</blockquote>