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black2003
Dodge Dakota
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5/01/2004
17:48:26
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 Subject: 2003 4.7 third cat
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Message:
i am going to be removing my third cat this week in hope of some performance gains. I will be leaving the stock muffler in place or will maybe replace it with a magnaflow of the same size because i like the sleeper sound. So far my mods are true flow intake, fastman 68, ho cams, ho manifold and removed clutch fan. Did anyone notice a gain when they deleted their third cat with similar mods? I have a 2003 standard cab 4x4 auto. It currently shifts at around 5400rpm's at wot.
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RCW
Dodge Dakota
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5/10/2004
22:29:48
|  RE: 2003 4.7 third cat
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Would someone explain what is the Third cat& where on a 2003 QC is it.
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I Will Try
Dodge Dakota
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5/10/2004
23:52:12
| RE: 2003 4.7 third cat
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If you have three cats there is one after each exhaust manifold and one after the Y-Pipe. If you only have one, it is after the Y-Pipe. Pretty simple. Not all have three cats. The 04`s I looked at(4.7s) only had the two after the manifolds,no third cat.(Massachusetts) My 03 only has one after the Y-Pipe.(also Massachusetts) I have the 4.7
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FLDak
Dodge Dakota
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5/11/2004
21:49:34
|  RE: 2003 4.7 third cat
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Message:
Black2003,
I've done all the things you have and then some. Take it from me, cut off everything after the pre-cats and go true duals. The Y-pipe is very restrictive also; it's like only 1-3/4" in diameter. I had 2-1/4" pipe installed just after the pre-cats back to a Gibson dual in/dual out muffler with tailpipes back to the rear bumper. You'll notice a differnce!
Hope this helps ya!
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Pittdawg
Dodge Dakota
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5/11/2004
22:20:19
| RE: 2003 4.7 third cat
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FLdak...thats exactly what i wanted to do, keep the precats cause i need um for emissions but put on a slightly larger y-collecter, how much did it run you, do u know how they did it, (i.e. just welded a new pipe in place, did it line up with the precats pretty easily? stuff like that) Thanks in advance.
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GraphiteDak
GenIII
5/11/2004
23:15:54
| RE: 2003 4.7 third cat
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Message:
I almost WISH I had the pre cats so it would be EASY to go true duals. But I got just the single Cat after the y-pipe.
I got to get some headers for my 03 QC and make my own pipe and cats from there.
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