I don't know of any aftermarket exhaust that gets better mileage than OEM. The main point of going aftermarket is to get more power/sound, which are things generally not associated with better mileage.
Ya i knew power and sound were the two biggies. Just curious if the mpg changes were due to the modification or the rider. I'm probably going to get the ecm at some point to. Also looking that the fmf slip on just cause it looks bad ass
Satin black powder coat, not a rattle can job. It's good for 1200 degrees, I had my headers done and other than the smell when they were baking in, it's holding up just fine.