Depends. Are comfortable removing the bumper (which is easy by the way) ? Go with the Gen 3's. Also requires some cutting of plastic pieces for the tubes. Gen 3's will def net you more gains. The K&N isn't a long tube/cold air intake and won't be any better than the stock air box & some drop-in filters performance wise.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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