The exhaust system finally gave up on my 01. 5 and I can justify going four inch. I have been reading the stuff posted here and wanat to know if the power elbow from banks is beneficial or bs. All I have for mods is an Edge EZ and KN. I just want an exhaust that will breathe a little better and be drivable. I was looking at Banks, Hog, or the Dpp systems. Any other input would be helpful. Thanks