Aaron Crawford of Fort Collins Muffler & Automotive Rocks! I called about an O2 sensor plug near closing time and didn't let them know i was coming, and at last minute i decide to race over before closing, as i entered the doorway, Aaron pulled the plug out of his pocket and handed it to me for free! I've had FoCo Muffler do work for me i the past including custom fabrication. FoCo Muffler ROCKS!