I have the 5 inch magnaflow and hate it, its well made and fits nice but drones, i liked the sound when your on tbe gas but its horrible at 60 and up. I ended up having to put a resonator after the turbo to quiet it down some. My buddy put a mbre stainless exhaust 4 inch and he said he liked it. If you are leaving it stock 5 inch wont help any unless you like the noise.