The success of the Metal Cat has spawned copies and imitations that you the end consumer need to be educated about . These illegal and  inferior products are in most cases Chinese cores being pitched at what seems a discounted price leveraging off the Metal Cat name. Others are imported biscuits , manufactured in China  that do not even pass archaic emission laws which are short production run for cowboys companies stamping a ‘cool sounding logo’ on the cat. These companies have no interest in meeting emissions and pluck flow figures out of the sky that always seem to defy physics. They then import and sell direct to the uneducated end user lying the whole way through the sale.

This especially holds true to the Magic , 'Xforce' and other 'new brands that continually enter the market under aspiring 'New Name Brand' companies. Why not as an exercise call them and ask them to fax you through their EPA/CARB/Euro test results from manufacturing factory?