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I think I'm going to go against the grain and say if the BMW engineers thought it was necessary they would have put one in there. Honestly I only have experience with OCCs when running a big turbo on big boost (30+ psi) at which point its a very good idea. For our tiny little snails, naaaaa....
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Stable: 2008 E90 335i JB3 etc..., 2006 Range Rover HSE, K7 GSX-R 600
Former Stable: 2008 MB C300, 2007 Chevy Avalanche, 2006 Evo IX (544awhp), 2005 Sti, 2003 Evo...
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