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Okay. So I guess I should explain somethings.
First off yeah you're right if I want a fuel efficient car I should have bought one. However this is the vehicle I wanted already knowing that it has poor mileage. on that note mechanics is also what I enjoy doing. And I like to make things run better and more effieicent. Doesn't matter what vehicle I have I still do try to make the vehicle a little more efficient.
Egr- I know most people get pretty uptight on this topic. My view. I think it's bad. I don't like the idea of exhaust getting pumped back into my intake. Resulting in excessive carbon deposits in my intake manifold and my combustion chamber. The carbon build up results in hot spots that are prone to predetonation and knock which cause ignition timing to retard resulting in lower power and efficiency. And don't forget those carbons that deposit also flake off and can cause damage to your cylinder walls and valves. The carbon deposits are like sand. So no thanks. Also any vehicle I've tried the egr delete has resulted in better fuel economy. Some other people say it doesn't work but for me it has made a significant difference every time. And for the xterra it gave me a solid 2-3 mpg. That was tested abab.
Also the cats getting drilled out and not making a difference. On my previous vehicle it made a noticeable difference. I can't really do an abab test because it's kind of a permanent fix. However if you look at the original xterra manifolds compared to the new stainless headers you would understand why drilling the cats out didn't make a difference. The original cast manifolds have an extremely high restriction design due to the small space to put exhaust I would assume. Either that or Nissan just hates me I don't know. But anyway the manifold goes from rear cylinder to the front cylinder and then does a 180 to the downpipe. If I could upload pictures from my iPhone I could show you more. But I'm assuming that the cat delete didn't make a huge difference because of the extreme restriction of the stock manifold.
But I've been really happy with the results with xterra so far. Efficientcy has improved quite significantly from 13mpg to 22mpg. Also it has quite a bit more power now which is another good plus. Also the engine runs smoother and I've gained 2" hg at idle and my highway is now 12-15"hg as apposed to 8-10"hg.
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