I have a 5.4l 2003 F150, i have the stock exhaust system with the 2.5 inlet and outlet piping, i just swapped out the stock muffler with a Flowmaster Super 40 series. The sound is very dissapointing and isnt loud enough. What is an easy, cheap way to make it louder?

 

Remove the Fartmaster and straight pipe it.

 

^ What he said.

 

My first thought when I read the title was the same.

Louder than a 40? No muffler at all.

 

The cats act as a muffler. Straight pipe will surely make it louder.