Precautionary maintenance before software tune?
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09-11-2011, 05:58 AM
Drives: 11' 135i
Join Date: May 2010
Location: Georgia (hearts still in Germany)
Drop in air filter like AFE or K&N would open the breathing a little. Not sure I'd do the plugs as well unless your tuner recommends it. Plugs will last quite a while and aren't cheap.
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