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02-15-2011, 01:47 PM
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#62
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Lieutenant Colonel 
Drives: 2010 135i,1989 PRO3,2001 530i
Join Date: Aug 2009
Location: Portland,OR
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Quote:
Originally Posted by BimmerEngineer
No real performance gain to be had between the two but maybe 1-2 hp.... Slight sound difference AND not worth the price difference to do catless....
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