Hello everyone. I have a question that I hope someone has an answer to. I have a 2005 F150 FX4. I am looking to get an exhaust put on my truck. A coworker of mine has a Flowmaster original 40 on his Ram 1500 and it sounds mean. I was looking to put the same on my truck, but I would like to see if anyone put the original 40 on their truck and how they liked it. I live in a state where I can't cut off my cats though, so thats not an option. Mainly the questions I have are: How does it sound from the outside? How does it sound from the interior? And do you notice any improvement in MPG or horsepower? Thanks for taking the time to answer.