I'm looking into buying a oem muffler and resonator from a 2007 f-250. I've searched the forums but cant find out if they flow well. The only thing I know is that its a 4" exhaust system. I want to put it on my turbocharged Sierra to quiet the exhaust down. It currently has a 4" muffler that dumps underneath the passenger side seat. I'm hoping by switching to the factory exhaust it will bring the tone down and not hurt performance. Any info is appreciated.