New to this site so introducing myslef, name is jason drive a P reg 328auto coupe as a new toy for myslef,been a bmw driver for 10 years but only in a 318is,i've done the 328 bodywork and interior to evo standard, so now time to concentrate on the engine,It's advice really on what to do to it and what common problems do these engines have,i've been told to put on a second hand m50 maniflod for extra bhp and changing the diff helps?,i'm looking to spend a max of £500 on the engine side,i'm mechanically minded but always helps to get advice from others as im no pro.