Okay, here is the deal, i want to put a dual cat bac exhaust system on my 2000 F-150 which will cost 500-600 dollars, my dad says that he doesnt see a use in changing out a good exhaust system when there is nothin wrong with it. Its my money! Will someone please give me some arguments that i can give him as to why i want to do this and why it will be better for the truck?