[Cloud9blue]

Not trying to be a hater... But there is almost no point doing all of these works unless you are stripping down the interior and going with a lightweight racing seats (you can probably save a 100lbs just be switching the seats alone, going with a stripped down interior would probably net another 100-300lb saving, but why are doing that to a brand new $80k M3 is the question)...

Most of the weights in any modern BMW are in the sound insulation and stock seats. And unless you racing competitivelyp, it would be just a waste of money. If you want faster times, spend the money on sticker tires and better driving skills instead.