2003 4.0 v-6
So I have an '03 4.0 V-6 with stock everything except the muffler back. I have a FLOWMASTER 40 on it but how do I get more sound out of it? Can I remove 1 of the 2 CATS on it?
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you could but then you would run into O2 sensors going nuts cause they are on the cats, i put a cold air intake in my 4.0 and my friends ask what i have fore exhaust but i got a flomaster 40 and thats it after the cat and its pretty loud
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so your saying that if i put in a cold air intake into the truck it will give it better performance?
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i want to put a KandN cold air intake in my 3.0 eventually. this may sound weird but i read somewhere (dont remember where) that 3.0's already have a cold air intake in them? does anyone know if this is true? and can i really expect a respectable amount of performance gain of of it/is it worth the money.
oh and im getting a flowmaster next week. i was planning on the 40 but might go with the super 44 cause its a little louder. |
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I removed one of the 2 cats under my truck with a straight through 2.5in tube and welded in an O2 bung for the sensor. That opened up my throttle response, a few mpg's and some sound for all around $30 for the bent tube to take the CAT's place.
I'm also running a SI/SI flow40 2.5" turned down at the muff. When I put the Super44 SI/DO 2.5" on I'll let people know the differences between the muffs. |
what year is your truck tre? looks like an 03 but not to sure. amd which cat did you remove, the closest to the headers or closest to the muffler?
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Here's my pics:
http://i20.photobucket.com/albums/b2...9/IMG_0272.jpg http://i20.photobucket.com/albums/b2...9/IMG_0274.jpg http://i20.photobucket.com/albums/b2...9/IMG_0275.jpg I cut off the last cat in the system, the one closest to the muffler and welded in a straight 2.5" pipe with an "S" bend in it... Also drilled out a hole for the o2 and welded on a bung for the o2... My truck is an 01... But only parts of it are still 01 lol |
haha lol whats a bung how does that affect the o2 sensor? does removing the last CAT still allow you to pass emissions?
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the BUNG is where the 02 sensor goes into the pipe before and after the cat and correct me if im wrong but the last cat the real one you have 2 one is a precat and the other is the auctual one
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does removing that last cat increase sound and allow for a pass on emissions?
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not sure about the emissions part but it wiould sound different and it would increase sound because you would be opening up the system
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so remove the second cat, put a filler pipe on and bung it?
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