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Didn't know they make headers. That 700 is just for the driver side. Maybe better off to replace with oem lol. That header doesn't even look very nice. Look at the egr bung, they welded a pipe onto the header and then the bung onto the pipe
 

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Discussion Starter #3
Didn't know they make headers. That 700 is just for the driver side. Maybe better off to replace with oem lol. That header doesn't even look very nice. Look at the egr bung, they welded a pipe onto the header and then the bung onto the pipe

Yeah 1400 for both sides is kind of ridiculous. They do come with cats but then 900-1000 for a set of headers then is nuts.
 

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The Magnaflows have been out for awhile. I've seen them for around $650 each side, but that's still way too much money, IMO. However, it does look like it would be a less restrictive system than the stock exhaust manifolds. Doug Thorley makes a nice set of headers, but they only make them in long-tube style, which deletes the front converters. Most that use the Doug Thorley don't run any converters and use CEL eliminators at the rear O2 sensor locations. Those run $473/set, which is a little more manageable.

https://shop.dougthorleyheaders.com/collections/2003-nissan-frontier
 

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Discussion Starter #6
Been looking at these, not headers really but a solid ex man at 1/2 the price.

More Information for EASTERN CATALYTIC 40852

I have an 01 which still has the separate manifolds and cats. I need to replace my cracked manifolds but I have had no indication that my primary cats are bad. However the truck does have 185k on the clock.

I'm having a hard time deciding whether I should pony up the extra cash to replace the cats. And if I do, are the one piece manifold/cats a better way to go?

The truck likely gets driven less than 1000 miles a year now. The original primaries may last the rest of the trucks life if I don't get a hole somewhere. I am going to delete the secondaries with the walker pipes though.
 

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If they aren't triggering any catalyst codes and are structurally okay (meaning, not getting ready to rot through), I would just replace the manifolds, which are inexpensive on the aftermarket.
 
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