Removing CATS will this hurt or gain?
#1
#3
you will gain a little sound... u will lose alot of bottom end. the ones on the truck flow pretty good. back in the old days taking them off would increase some serious flow now days their so advanced that it doesnt matter ur gain wont even be noticable more then likely. save your time and get true duals with a balance pipe and it will be fine.
#4
#5
if it were me, i would just either keep my cats on and run straight pipes off of that or buy highflow cats from magnaflow. your not going to gain too much buy taking them off. remember a noise complaint ticket is WAYYY less then pollution tickets and even if your state doesnt have checks ( mn doesnt either) they can easily write you a ticket if they decide they want to tag you for as much as they can! i kno of many guys that use their trucks just for mud trucks and they still keep their cats on and have no problems with flow, taking them off will actually more then likely due more harm then good without a built engine that requires it.
#6
Keep the cats
Its still not worth the fine for removing the cats. The cats in total account for less than 1psi of back pressure in the exhaust. A good cat back system and headers will be more beneficial than removing the cats. Plus it will still meet emissions standards and these trucks tend to run better with some back pressure as well.
#7
It won't hurt your engine and it will give you a little more power not much because these cats only have about 2.5psi of backpressure. And no matter what every one says backpressure is never helpful. If you go true duels use a x-pipe, it will keep the same amount of power on the low end. Be sure to use oxygen simulators on the two downstream sensors.
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#8
#9
#10
Your FAR better off removing the muffler. I wouldnt take the cats off.
The reduction in back pressure is minimal and the cats actually help clean the exhaust "better for the enviorment"
I aint a hippy, I just dont see any reason to increase the amount of pollution your truck makes if it isnt going to help your performance any?
Remember also that when you decrease your back pressure, you increase your HP at the cost of Torque.
Pay attention to racerf150man's posts. It sounds like he knows what hes talking about.
Theres already a fairly lengthy discussion about this in the V6 forum.
https://www.f150online.com/forums/sh...d.php?t=201322
The reduction in back pressure is minimal and the cats actually help clean the exhaust "better for the enviorment"
I aint a hippy, I just dont see any reason to increase the amount of pollution your truck makes if it isnt going to help your performance any?
Remember also that when you decrease your back pressure, you increase your HP at the cost of Torque.
Pay attention to racerf150man's posts. It sounds like he knows what hes talking about.
Theres already a fairly lengthy discussion about this in the V6 forum.
https://www.f150online.com/forums/sh...d.php?t=201322
Last edited by Podunk; 06-29-2005 at 01:03 PM.
#11
Actually removing the pre-cats doesn't add to the pollution, they are just there to get the truck to pass emmisions tests on cold start-up since they warm up so much quicker. After a minute or so the primary cats do the same job cats have been doing for years now. Don't remove all together...either do away with the pre-cats or replace both with Magnaflows if you want to spend the money. You won't lose much on the bottom end unless you're also running straight pipes. Even then my 4.6L ext. cab 4x4 can turn the 60 lb. 33's on command with 3:55's.
#12
#13
I have removed the back 2 cats and left the front 2 on my truck. Put in a single Magnaflow and cut the tailpipe off at the very last hanger. I personally like the sound and it keeps it way behind you for noise. I couldn't tell much difference in power when I did it, but it did seem to pull a bit higher on the top end.
#14
if a cat is working correctly, it wont cause any restriction, and your states are pretty harsh, in md all we have to worry about is emission testing, unless there is a sound ticket given, at which point either a state trooper, or a qualified maryland inspector has to go over it, and sign the citation.
#15