Deleting The Back Cats

T0L3G1T · #1 10-23-2009, 10:38 AM

Hey guys, i have a lifted 02' f150 5.4L FX4. I was wanting my exhaust to sound alittle more throatier if you know what i mean... Right now i just have the stock exhaust piping with a dumped flowmaster 1 in 2 out. I was wondering if i were to take the back cats off of my exhaust and replace them with the same size piping as the rest of the exhaust and put spark plug foulers inplace of the 02 sensors(which does trick them).. Will it make my exhaust sound like that crackle and pop sound or will it just make the exhaust deeper sounding and meaner? I also don't wanna loose any low end tq either.. Let me know what you guys think, thanks!

-Brandon

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DarrenWS6 · #2 10-23-2009, 01:48 PM

It will roar.

avfrog · #3 10-23-2009, 02:14 PM

A cat delete should help you out in low torque due to higher exhaust velocity shouln't it Darren?

2001 5.4 · #4 10-23-2009, 02:15 PM

it will be SO much louder. i just did this on mine last month.

avfrog · #5 10-23-2009, 02:25 PM

Quote:

Originally Posted by 2001 5.4

it will be SO much louder. i just did this on mine last month.

We MUST see a video of your 10's H piped!

2001 5.4 · #6 10-23-2009, 02:36 PM

Quote:

Originally Posted by avfrog

We MUST see a video of your 10's H piped!

i would if i could man. its freakin loud and sounds awesome

migdaddy · #7 10-23-2009, 03:42 PM

i dont think u really have that setup, or you would post a vid.

avfrog · #8 10-23-2009, 08:25 PM

Quote:

Originally Posted by migdaddy

i dont think u really have that setup, or you would post a vid.

X2

fordracing200 · #9 10-23-2009, 10:11 PM

how do you guys delete them? do you use band clamps or do you weld the new pipes in or??

avfrog · #10 10-23-2009, 10:48 PM

Muffler shop welded in a piece of pipe and sniper tuner deleted my rear o2

stevenminix · #11 10-23-2009, 11:22 PM

im wanting to run 2 cats instead of four on my 99 f150 i just wanna know which o2s to keep front closer to engine or rear and wha will happen if i just weld a bung in place in pipe and place o2 sensors in em.. i was gonna run 2 maggies high flow round spun cats instead of the 4 usual cats.. will it cause problems if i just run 2 o2 sensors on true dual setup or do i have to keep all 4 o2 sensors and why? i just have a edge evo tuner and its not a gryphon..

DMD09 · #12 10-24-2009, 01:11 AM

Would deleting the first set of cats and gutting the last ones with the non foolers be good? Ive heard gutting them makes the exhaust sound deeper, and i already have flowmaster 40 on my system

DarrenWS6 · #13 10-24-2009, 03:38 AM

Quote:

Originally Posted by avfrog

A cat delete should help you out in low torque due to higher exhaust velocity shouln't it Darren?

Not entirely but it helps your the powerband.

Quote:

Originally Posted by DMD09

Would deleting the first set of cats and gutting the last ones with the non foolers be good? Ive heard gutting them makes the exhaust sound deeper, and i already have flowmaster 40 on my system

Gutted cats will interrupt velocity pressure killing your low end & high end. Running pipe through the gutted cats to look legal or run pipe inplace to retain energy.

DMD09 · #14 10-24-2009, 04:00 AM

Quote:

Originally Posted by DarrenWS6

Not entirely but it helps your the powerband.

Gutted cats will interrupt velocity pressure killing your low end & high end. Running pipe through the gutted cats to look legal or run pipe inplace to retain energy.

Thanks Darren!

T0L3G1T · #15 10-24-2009, 05:10 PM

so it will make it sound meaner, but it won't crackle and pop?