Big gain in mpg and performance
Factory system on my 2015 Yukon xl had a valve behind the muffler. It was for the Active Fuel. Management system. ( 4 cylinder ) It was rusted frozen partially closed. So I gained 3 mpg, robust performance, and great sound too. Had to reuse the clamp off the catalytic but had the system on in an hour. NYS rust is killer here. The truck runs like it should now!
