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      01-30-2013, 12:02 PM   #2
rorkor
Second Lieutenant
 
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Drives: '11 E90 N52 6MT
Join Date: Feb 2012
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Posts: 278
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Garage List
2010 E70 X5 35d  [5.00]
2011 E90 328i  [5.00]
Define medium priced? The cliff is from hundreds to thousands. Low cost and nearly as effective as all is K&N and Charcoal delete on the stock box. For sound without performance, and I mean likely loss of performance, an open filter like the sumitomo is likely your best bet. For performance without much sound, the PI or Eurobox are at opposite ends of the cost range from each other and are pretty much the same performance wise. Systems like the AFE Stage2 sit right in the middle but have mixed results/satisfaction from our members.
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