I have a 01 5.4 F150 when you begin to take off it has a noise that kind of sounds like a really bad exhaust leak, but it only does it when I take off and only for about 3-4 seconds. Any suggestions?

 

Where is the sound coming from? Manifold leaks are common in your generation. If your exhaust is 100% stock and unchanged its very much due for a new system.

 

Check the muffler also, I have an 02 screw with 84k and a 00 scab with 94k on it and they both make the same noise and need the muflers replaced!

I would like to replace the system on my 00 with something else but not sure on what to get?

 

That was my first guess, It just started doing it Fri morning, so I will take it in Monday to be checked. It is all original for the most part with 150,000