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Originally Posted by Sammy Sandbag
That's understandable, sorta why I still have my oem exhaust in the corner of my garage. I don't think you'll have any problem passing emissions since you still have your cats. It's my theory that Nissan installed those second cats on the 4WD Titans as a spark arrestor, not for any emissions reasons.
If I ever get a welder I'll probably end up installing something like those resonators with some straight 2.5" pipe from the headers back. Should help get rid of the crackling I now hear. Another thought I had was installing resos down stream from the muffler, just prior to tips, in an effort to get rid of the drone. I'm contemplating just trying all different kinds of configurations till I get it sounding right then redoing the whole thing with new tubing.
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Sammy...if you don't want/need SS bullets, like gr8titan's, you can go with the 2.5" aluminized steel Dynomax Race Bullets, like myself and m95roadster have done. They are $31/ea at summit racing. The O2 bungs were $5/ea, also from summit. No rasp or popping at all. Also, you'll need more than just a welder to do these yourself. There are several subtle bends necessary for alignment of the flanges. I watched the shop tech do mine, and it took him about 3 hrs to do both sides. Got mine done as a side job, so luckily he only charged me $30/side for labor and flanges.
My theory on the reason for the rear cats, based on asking the question numerous times to exhaust shop owners, is vehicle weight. The 4wd's weigh more, thus slightly more toxic emissions due to increased engine load. I believe both 2wd and 4wd Armadas have rear cats, probably for the same reason...weight. It's the only thing that really makes sense to me, so far.
Here's a couple pics of m95's reso's...mine are pretty much identical.