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By the way, people have reported mpg gains with those 30 EUR performance DME chips from ebay. The M30 3.5i is also quite restricted from factory so I guess there is room for improvement with "chip tuning".
If you`re into weight savings, the center exhaust silencer weighs about 30lbs and there is absolutely no need for it in a track car plus the engine breathes better at high revvs.
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