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A buddy of mine went to Ultimate Bimmer Service in Dallas, got the Walnut Blasting done and before and after pics. He said his 135i with COBB stage 1 got almost 15% in fuel economy, just riding around with him we could tell the part throttle response was night and day. and of course full throttle was now even more tire smokin. They only charge $500 as well, I am going to be taking my M3 and 330i to these guys!!
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