moto-m Posted July 14, 2011 Share Posted July 14, 2011 I have read through other topics about exhaust for the R50 but am still unclear as to the best way to go. I am looking at deleting the resonator and installing a performance muffler with a single outlet. I am thinking about using as much of the stock tubing from the cats so I don't lose torque. Would it make sense to just cut off the exhaust from righ before the muffler, put in the performance one, then run it to the back? What size inlet/outlet should I use? Link to comment Share on other sites More sharing options...
180sx Posted July 14, 2011 Share Posted July 14, 2011 You want the single combined pipe to be no more than 2.5". I would even run 2.25. These are not made for great top end (although this can be had). What muffler are you getting? Link to comment Share on other sites More sharing options...
moto-m Posted July 14, 2011 Author Share Posted July 14, 2011 You want the single combined pipe to be no more than 2.5". I would even run 2.25. These are not made for great top end (although this can be had). What muffler are you getting? Not sure yet but I was thinking magnaflow. Should I get a single in/out or a dual in/single out? Link to comment Share on other sites More sharing options...
moto-m Posted July 14, 2011 Author Share Posted July 14, 2011 Also, would it be better to repipe from the cats back or leave the stock piping to the muffler? Link to comment Share on other sites More sharing options...
Kingman Posted July 15, 2011 Share Posted July 15, 2011 If you have the money, do a single 2.5" system from the manifolds back. Link to comment Share on other sites More sharing options...
moto-m Posted July 15, 2011 Author Share Posted July 15, 2011 Looked under my truck and looks like I have the California emissions exhaust version. See parts 20010 and 20020 from the diagram below. Can I delete these and put straight pipes? Will this improve performance? Link to comment Share on other sites More sharing options...
moto-m Posted July 15, 2011 Author Share Posted July 15, 2011 Also, can I get rid of the mess of heat shields? Now I am thinking about what Kingman said, trashing everything from the cats back and doing a Y-pipe to a single system. Link to comment Share on other sites More sharing options...
180sx Posted July 15, 2011 Share Posted July 15, 2011 you live in florida. you don't need any of that stuff. You could do a single 2.5" exhaust. Would sound throaty. Or, if you do dualall the way, use 1.75" tubing for each bank. I do like the single exhaust idea though... Link to comment Share on other sites More sharing options...
5523Pathfinder Posted July 15, 2011 Share Posted July 15, 2011 So this was my brothers 99 QX4. He had a Magnaflow muffler put in and a dual tip. Please disreguard the wheels and stuff... Link to comment Share on other sites More sharing options...
moto-m Posted July 15, 2011 Author Share Posted July 15, 2011 So this was my brothers 99 QX4. He had a Magnaflow muffler put in and a dual tip. Please disreguard the wheels and stuff... That sounds sweet. Is that from the cats back or just swapping out the muffler? I have a nice black chrome ss oval tip I'm going to use. Link to comment Share on other sites More sharing options...
5523Pathfinder Posted July 15, 2011 Share Posted July 15, 2011 It was a custom system welded in. They cut the factory muffler off, then welded in the Magnaflow muffler and all new pipe from there back. IIRC, it cost around $300. Link to comment Share on other sites More sharing options...
sewebster Posted July 15, 2011 Share Posted July 15, 2011 Also, can I get rid of the mess of heat shields? Now I am thinking about what Kingman said, trashing everything from the cats back and doing a Y-pipe to a single system. Presumably the heat shields are there to prevent your body from getting hot and increasing the rate of rusting. I know my exhaust has no shields and I just repaired holes in the floor in the places where the pipe gets close. But I have a WD21 and live in Canada... Link to comment Share on other sites More sharing options...
moto-m Posted July 15, 2011 Author Share Posted July 15, 2011 It was a custom system welded in. They cut the factory muffler off, then welded in the Magnaflow muffler and all new pipe from there back. IIRC, it cost around $300. Yeah, that's what I was going to do. But now I saw those California emissions pipes under my truck and am so tempted to chop them off. Link to comment Share on other sites More sharing options...
Igetstabby Posted July 15, 2011 Share Posted July 15, 2011 Lots of info and opinions on exhaust pipe diameter here http://www.nissanpathfinders.net/forum/index.php?showtopic=28877 Personally I went with dual in/dual out magnaflow (2.25" pipe). I like it for the most part. Had to sacrifice my spare tire, but the idea is to build a rear bumper/carrier eventually. Link to comment Share on other sites More sharing options...
moto-m Posted July 26, 2011 Author Share Posted July 26, 2011 Would it be a bad idea to remove the cats and install an oxygen sensor simulator? Would I lose substantial torque? Link to comment Share on other sites More sharing options...
moto-m Posted July 27, 2011 Author Share Posted July 27, 2011 So I am looking into swapping out the extra resonators after the cats with straight pipes and this is what I was told from a seller on ebay: "This pipe will not work for you. You have a converter in your system, Ca emissions, and this is for Fed emissions only. If you replaced your converter with this pipe, you will trip the computer and run the risk of ruining all your converters. If you send us your make, model, year, engine size, and side you need, we will look for the right replacement for you." Aren't the pipes just extra resonators? There is no oxygen sensor after them so I don't see how it would do anything. Link to comment Share on other sites More sharing options...
Kingman Posted July 27, 2011 Share Posted July 27, 2011 He's mistaken. Pretty sure he thinks you're talking about removing the cats and putting straight pipes in. Link to comment Share on other sites More sharing options...
moto-m Posted July 27, 2011 Author Share Posted July 27, 2011 He's mistaken. Pretty sure he thinks you're talking about removing the cats and putting straight pipes in. That's what I thought. Are the pipes a direct fit if I swap them out? I am thinking about doing that then cutting the exhaust at the muffler and going performance from there back. Seems like the most economical way. Link to comment Share on other sites More sharing options...
Slartibartfast Posted July 27, 2011 Share Posted July 27, 2011 He said it would ruin the converters, so I doubt he meant cutting them out. Still, I have no idea how a straight pipe would damage the cat... Link to comment Share on other sites More sharing options...
moto-m Posted July 27, 2011 Author Share Posted July 27, 2011 California is really starting to piss me off Link to comment Share on other sites More sharing options...
moto-m Posted July 27, 2011 Author Share Posted July 27, 2011 Now I am starting to wonder if my truck has a california version ECU. Anyone know if they are different or if the differences are strictly mechanical? Link to comment Share on other sites More sharing options...
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