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06-2008 BMW E60 E65 E66 750i 550i 650i 750Li 750 N62 V8 4.8L ENGINE MOTOR 145K | eBay
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BMW 550i E60
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Any good tunes for an E60 550i? I heard there weren't many options but any advice on getting this thing to surpass ~400 horse would be helpful. And plug and play or