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My 4.8is

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Hi there. You seem to know your stuff about BMWs on here so I'm after some advice. I own a 2005 4.8is with 90k on the clock. The engine is factory standard. What would be the best engine mods to do to gain a good bhp boost without it running rough on idle and sluggish through the gears. I have about 5 k to spend at present. Ideas please. Many thanks. Ricky lazenby. riklazsgn@gmail.com

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