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dewalt
Dodge Dakota
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9/24/2002
11:58:17

Subject: 2000 4.7 ?
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I have a 2000 4.7 slt cc i want to remove the cat and put in flowmaster cat back and get the shop to weld it all up question is were do i need to start running the 3" pipe just at the y were the two come from teh manifold or do i replace the y pipe with bigger one or what. and is there any better cat backs than teh flowmaster i want something that aint to loud that just sounds good and has good preformance gains.

Thanks in advance.



EyeTrip
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9/24/2002
13:54:50

RE: 2000 4.7 ?
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I have a friend that bought the gibbson cat back setup. And he wanted to keep his spare tire, so he had to take it to an exhaust shop to get it tweaked. After it was said and done it's best to just have the shop do the whole thing. It's faster, cheaper and you don't have to worry about it if something isn't right, you can just take it back to the guys and have them fix it.

As for removing the cat, you will have to get a 02-sensor cheater. If you have emissions then I would suggest a high flow cat instead of removing it. The 4.7 needs some backpressure unless you run the big heads and cams with a s/c, so you might want to leave the collector alone.

Just my opinion, I think you would be better off to have a shop install a high flow cat and a magnaflow muffler.



dewalt
Dodge Dakota
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9/24/2002
19:09:51

RE: 2000 4.7 ?
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but if i do get them to do it do i tell them to run teh pipe just to the y where the other two come in or do i need a new 3" y i am gona let them do the work but i still want to remove the cat cause i will be getting a s/c in the future will they be able to just weld a place for the o2 or what




EyeTrip
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9/25/2002
02:02:01

RE: 2000 4.7 ?
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You will need a "O2 simms box" I believe speedtweaks has them. The second O2 sensor is for the PCM to check the cats condition. If you remove the cat then you will flag the PCM, and we all know we need to keep from pissing off the PCM.
If you going to S/C with a Kenne Bell then yes go for the 3" collector because it's a twin-screw type and develops more low-end pressure by nature but keep in mind you may have a low-end bog. I would suggest you check around a little bit more with some guys here that have done it already. The 4.7 is a different critter.

I hope this helps


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