I think I would have to rip out that 3 inch and go bigger. I have a '02 7.3 now with 4 inch. Sounds good, especially since I lost some hearing in service and I like hearing my truck. A little more power and better coming "out of the hole". Whoever did the 3 inch must have liked the sound a real engine makes! HA! Good luck, God Bless, and thank you for your service to our country.