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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #16  
Old 03-25-2008, 02:44 PM
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Peter94 Peter94 is offline
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I bet you didnt even remove the cat. Any vehicle after 1996 has downstream 02's to monitor the performance of the catalytic converter. I bet they were just resonators to reduce noise. In any case DO NOT remove catalytic converters. It does no good. The reason they got such bad flack is because when they came out, they used pellets coated platinum and other rare metals, which would cause an exhaust restriction. If you look at the material out of a cat today, it is a honeycomb type material, that DOES NOT restrict exhaust flow. Anyone who says they cut off their cat and gained 20 HP is on crack, that is unless they have some engine problems, and had a clogged cat.

Think of it like this, if Ford is engineering a vehicle to compete with Dodge, Chev, Toyota, they WILL make the cat big enough to handle all the exhaust the engine can put out.
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  #17  
Old 03-25-2008, 03:22 PM
Kevin_JG Kevin_JG is offline
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removing the cats does nothing performance wise, adds more sound, but when you run through town with your exhaust and a cop pulls you over thinking you have striaghts, and then puts a smog tester up to your exhaust.. youll think twice about removing them..
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  #18  
Old 03-25-2008, 05:09 PM
dadirtydogg dadirtydogg is offline
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[QUOTE=Peter94]I bet you didnt even remove the cat. Any vehicle after 1996 has downstream 02's to monitor the performance of the catalytic converter. I bet they were just resonators to reduce noise. In any case DO NOT remove catalytic converters. It does no good. The reason they got such bad flack is because when they came out, they used pellets coated platinum and other rare metals, which would cause an exhaust restriction. If you look at the material out of a cat today, it is a honeycomb type material, that DOES NOT restrict exhaust flow. Anyone who says they cut off their cat and gained 20 HP is on crack, that is unless they have some engine problems, and had a clogged cat.

well i clearly never said that i gained any power only that it increases the volume of the exhaust. there are two cats, THEN THE DOWNSTREAM O2 SENSORS, as i stated before. the two rear cats are located after the sensors. i suppose they could be resonators, but everyone i've ever talked to called them cats. and from what i am told, not 100% sure so don't quote me, they are for noise reduction only. i live in alberta and cops don't have smog detectors here. so that wouldn't be an issue for me anyway. also, when i put headers on i'm going to eliminate the front two cats and put in O2 sensor simulators
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  #19  
Old 03-26-2008, 09:11 PM
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Hey, I'm not trying to get on your case dadirtydogg. I'm just saying that you probably didn't even remove any emissions equiptment (cats) so you dont have to worry about getting in trouble or anything. I would have cut off the resonators too if I had nice new truck like that! My GF's mom just got an 06 F150 CC, and i'm trying to talk her into duals, lol
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  #20  
Old 03-27-2008, 11:57 AM
NGibbons55 NGibbons55 is offline
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HEY dadirtydogg where in alberta are you from?? Im looking at taking my cats off too to make it louder, can u give me some info, I want to do it myself because the shops wont do it.
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  #21  
Old 03-27-2008, 05:43 PM
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Originally Posted by NGibbons55
HEY dadirtydogg where in alberta are you from?? Im looking at taking my cats off too to make it louder, can u give me some info, I want to do it myself because the shops wont do it.

Take the muffler out.....it will be PLEANTY loud that way...i'm confident its as unlawful to remove the cats up by you as it is by us.....and again...theres really no benefit...
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  #22  
Old 03-30-2008, 12:58 AM
dadirtydogg dadirtydogg is offline
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i'm in grande prairie... my buddy let me use his hoist and welder.... i had to drop the exhaust down to get the weld properly around the top though. was a little bit of work.... i ran my truck with no exhaust when i put my magnaflow muffler on and it was loud, but i prefer the sound with the muffler and the two cats/resonators removed
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93 Camaro mild cam, 1 3/4" ss headers, flowmaster 50s, no cats, cai, plat plugs, msd coil, cap & rotor, 8.5mm wires, 3.73s, 160 therm, 6 speed, lowered, 18" 5 spokes
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  #23  
Old 03-30-2008, 09:37 PM
Brolli Brolli is offline
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y not just replace all four cats with two high flow performance cats. That should be legal on all accounts. No?
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  #24  
Old 03-31-2008, 03:28 AM
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Originally Posted by Brolli
y not just replace all four cats with two high flow performance cats. That should be legal on all accounts. No?
yes, that is the only way to do it legally.
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  #25  
Old 03-28-2013, 09:25 PM
Infantryman1991 Infantryman1991 is offline
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Well done here in louisiana we like loud exhausts and there's no inspection no smog detector crap or any of that I cut my back two off true duals strait pipe with an x sounds better than duck commander duck call
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  #26  
Old 05-24-2013, 12:10 AM
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I took all 4 off of my 04 f150 4.6 with an x and 2 flowmaster super 40s and I travel in it from rgv to indiana and no problems
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Old 05-24-2013, 12:10 AM
 
 
 
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