I think this question may have been asked here before by other members. I have an '07 Ram with the 5.9L CTD and am looking to install a Banks "Monster" exhaust system on it. I was wondering if it hurts the engines to remove the catalytic converter, because I noticed that Banks has some exhaust systems for the turbo back which would mean removing the converter. Also would it help my mileage at all?

 

You can get away with it on a 5.9 as long as you dont have local inspections......

 

Do you mean roadside truck inspections? We have state inspections here in New York State, which are done once a year, but I know a couple shops that would "hook me up".

 

Your truck came from the factory with a 4" exhaust system from the turbo all the way to the tip. Buying an aftermarket exhaust would be a waste of your time and money, unless you plan to add BIG power like over 500 hp to the truck. You can get a muffler replacement if you want better sound and not spend a fortune on it. The cat on your truck is not a restriction, mine still lives in it's normal place. If you are set on getting rid of it you can, but again there is really not much benefit to you unless you plan big power mods.