What we need is a good aftermarket Y pipe. The crunch at the joint is the worst I have seen. This surely doesn't help the mileage. Learning to get the fuel save to engage as often as possible makes the biggest difference. It also kills the fun.

 

What is the parts number for the 18" magnaflow. I can't seem to find it for my 2010 ram 2500 5.7L.

 

couldn't have said it better!!.. the restriction starts at the exhaust manifold!