Hey I have a 2003 ford f-150 v8 5.4 with flow master exhaust and want a louder and also deep sound to the engine. I looked at qtp cutout valves and wasn't sure if that was the right way to go. I know I see a lot of more sport cars use it. Also how do I know the size of my exhaust pipes that I have? Thank you
Measure the pipes but it will be hard to get a deeper sound out of a 5.4 L engine. If the mufflers have been on for a short time give them more time to heat it up more maybe get some stuff out. You could always put cherry bombs on, they would be quiet at first but get louder as fiberglas gets out of them.