Hey guys I want to remove my cats. Just A few questions for ya!
How many cats do I have? Should i remove them all?
When i do the O2 Sensor trick with the spark plugs, do I have to drill new holes in the pipe that i replace the cats with?
Will I hear/feel a significant difference in sound/performance?
Will my popping under WOT go away?

I am driving A 2005 F-150 XLT 5.4L V8 removed muffler and replaced it with a 14inch Magnaflow Muffler and then had the exhaust shop run a piece of pipe out of the passenger side right before the rear tire ( all 2.5inch/stock size in diameter )

THANKS!!!!

MAC

 

i posted a similar thread and i was told that our modle f150s have high flow cats anyways, removin them will do almost nothing good, if you do it will throw up codes and you will have to have the codes deleted and it can in the long run hurt your motor, it will not improve preformance and get you in trouble with the law.... the list when on and on, just spend a little more money and run a true dual exhaust

 

Halfway through 2005 Ford changed from the four cat style to two cats. Crawl under and see how many you have. Look at a custom tune to turn off the rear O2s and account for the difference. Use Magnaflow 94106 cats and put the O2s about an inch behind them.
Sound: it will gain a little volume.
Performance: negligible gains.
Popping from accel/deceleration is normal differences in pluses, the cats won't help this.

As said before there's really little gain in removing them unless you want that little extra sound and the hassles that come with.

 

thanks guys and hey otto when i had the exhaust just dumped before the muffler it had WAY more popping and had terrible acceleration.. my buddies told me it could have been from a lack a back pressure so i put my new magnaflow muffler on and it still pops and hesitates a little under WOT what do you think??

 

Here's what I think of backpressure . Print this out for your buddies.

https://www.f150forum.com/f11/exhaus...re-myth-78102/