Debating on cutting out the secondary cat how much louder did it make it? Did you leave in the resonator that’s right behind it? Going to delete my muffler tomorrow on a 2016.
Was the an increase or decrease in fuel consumption? I had the free flow installed yesterday on my 2016 spark 1.2ls 5dr and for me it seems like I'm using more fuel or maybe its only my imagination because I'm driving to work and home only and haven't taken it on the open road yet