I did the search before posting, and the only user that showed with that, is " Mags" which had to cut, and I mentioned his name in my first question. 12580 is the muffler like you mention, but 15583 is the full catback exhaust including the muffler, and I was hoping the owners I saw on Ytube will be on this forum, or hopefully somebody here did the 15583 also.
Thanks, but your Magnaflow is the muffler with 2 in 1 , like most people on this forum, i'm looking for the complete kit catback from Magnaflow ( which uses their own Y after the cats ). By the way, very nice X.I have a magnaflow, I cant remember what the part number is but it is a new in and one out. The shop I took it too welded complete new 2.5" pipe from the cats back for less then $175.00.
Dont know if that help with your question.
Here is a link to my install, it is on page one
I'm not using anymore the Pathy V8 muffler. I went to the muffler shop, ( a very good one who works on WRX and EVO, mandrel machine, stainless tubing, etc... ), showed him the part picture from the Nissan parts web, and compared to the stock X muffler, and the guy completely discouraged me. He said that just replacing my Y pipe and muffler with the Pathy muffler is not going to do anything at all, just a waste of money. He said you want more air flow, you need a free exhaust, and you'll get more sound no matter which brand. No improvement without sound, period. That it why I came to the Magnaflow catback. But in the end, and given the price like you say, I think I'll end up with a 12580 or similar muffler and custom pipes.zeiter, if you're just going to use the Pathy V8 muffler as you state in another thread, then why would it matter? You would still need to weld that on to your existing stock tail section. I don't think anyone on here has the 15583, at least from what I've seen (or haven't seen). Most people have opted to go custom using the 12580 muffler and just getting new pipes ran from the catback to the muffler because it's just more cost effective.
I looked and found that also for the Jeep, which means that mechanic was kind of right that Nissan "squeezed" the short side of the Y pipe on purpose to create some equalization, and he would have to do 1/4" less diameter for the short side to recreate the effect. Then I look at Magnaflow, and find they have one kit for the Wrangler to delete the loop, and make it straight. Go figure. Why would Chrysler go through the trouble of creating a loop if straight would have been OK ( much simpler and cheaper for them ). I know we're talking Jeep here, but what interests me is the idea or principle behind it.I have never heard of different diameters but the newer jeep wranglers have a loop in the exhaust system on the driver side to make it the same length as the pass side. Kind of funky but cool at the same time.
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You got a point here, and after getting another answer that the Wrangler has a loop to compensate, it's beginning to make more sense to me.IMO it's not BS. Exhaust science, for best performance, is all about balanced flow into and out of the engine. Now would 1/4 difference in the two pipes make a difference on your truck in day to day driving? Probably not. However if you run your truck at higher RPMS a lot, or drag race it, you might notice the difference. I would think it would be cheaper to run both pipes the same and less hassle for the shop, so why would they even mention it if they weren't basing their statement on facts and experience? :dontknow: