i have a 2001 f 150 that has the 5.4 in it and lately i have noticed a loss of power in low rpm's i changed the fuel filter a while back as well as a couple of coilpacks after a night in the creek. i have no muffler on the truck jus cats im stuck and dont no what to replace i plan on cutting the cats of and putting a flowmaster on it let me know if you have a soulution to my problem or an opinion..

Did you notice the loss in power before or after cutting off the mufflers?

How many miles on the truck? Did you change fluids after sitting in the creek? What about electrical (plugs, cops)? Cleaned the maf and throttle body? Run seafoam through it to clean out the carbon build up? Keep up with regular maintenance? Added more weight recently? the 5.4's, from what I've read and heard, like to have a little back pressure so you might think about putting a muffler on and getting high flow cats instead of no cats(especially if your trying to keep it street legal) o and flowmasters are also known to loose some low end torque, look into magnaflow or something else.

i have a 2001 f 150 that has the 5.4 in it and lately i have noticed a loss of power in low rpm's i changed the fuel filter a while back as well as a couple of coilpacks after a night in the creek. i have no muffler on the truck jus cats im stuck and dont no what to replace i plan on cutting the cats of and putting a flowmaster on it let me know if you have a soulution to my problem or an opinion..

You just answered yourself. Loss in backpressure = loss in low-end

I did the same thing, but I knew what I was getting into and I lived with it. I gutted my cats (4 of them on these trucks) and left my Blowmaster on, and it didn't help. Throw a muffler on it if you want your low-end back.

the truck only has 70000 miles i checked spark plugs their good.. im going to buy a magnaflow muffler and install it for now maybe later add high flow cats when i feel like dealing with the pain to do so... thanks for the help