I am looking for a set of headers for my 02 6 speed but I dont know what route to go any help is greatly apreciated.

I was lookibg into obx but u see a lot of older post about the installation being a pita anyone tried any obx header install lately and have they fix all the issues they had in the past?

 

OBX or Cattman.

OBX is not bad for the 3.5, it was the 3.0 design iirc.
Schmellyfart knows a lot about it.

 

 

are the obx ones direct bolt on or you gotta play around to make them fit?

 

I use Cattman here one of the best 00-2002 exhaust for 5th gen Maxima.

 

OBXv2 need a little bit ground off from what I've read, but nothing major or hard.
Usually the hardest part is getting the heat shields and old headers off.

 

Substanial HP increase over gutted pre cats and y-pipe?

 

 

I was under the impression that schmelly's was from an Altima 3.5? Which is a little different. Also, IIRC, all of OBX's are for the 3.5L, whether it be Maxima or Altima, both of which do not have external EGR. 95-01 had external EGR, but it's a very simple modification to fit those on an 02-03 Maxima, not so much 02-03 on a 95-01. With that said, my Cattmans came off a 95, and fit on my 03 no problem with small EGR plug. 04+ Maxima (02+ Altimas) have a fairly different y-pipe design to fit their similar chassis as well as external EGR. Semi irrelevant here since you can get the 02-03 Maxima OBX units for a good price without all the leg work. OBX's are made for both the 3.0 and 3.5L


For the OP, what headers to go with. Come on man, it's 2013.

Cattman if you can find a set for a reasonable price. I've seen some FS lately and cringe at the mark up happening. I paid $590USD for used Gen I's back in late 2004.

If money is an issue, OBX's do the job. They might have a bit of a reputation for fitment issues and such, but IMO, the newest design looks fine to me and has been proven to be just as reliable and fitment has improved.

Shorty headers aren't worth the install time and effort. You're better off going with OBX's if you're trying to save a buck or 2.

Don't even entertain the idea of a y-pipe if you're looking for performance.


They're designed to be a direct fit. But as we all know, anyone who has turned a wrench or two that a little ingenuity goes a long way.

It's never been quantified, but it just seems like a better idea to get a set of headers vs gutting pre-cats, etc.

 

I went the obx route. The headers fit fine. No clearance issues with them. The worst part is getting old heat shields off, especially in the rear. The only "trouble" I had with the obx install was they wont fit if you tighten one manifold at a time. Put everything together hand tight before you snug everything up. Ive had them on for 5000 miles and havent had a single problem. So if your trying to save a little money, obx is worth it

 

I just finished putting my OBX headers up a few months ago. Only the only modifications needed on mine was the rear collector pipe was just touching the rear motor mount and I had to remove a bit from the mount to eliminate tapping. Also O2 sensor extending and relocating. Nothing major at all. Quite the easy install.

 

Ok sounds like obx is a good way to go if I wanna save a few bucks anyone knows of a good link to purchase them or just ebay? Also kind of off the topic but r intake spacers n bop a good idea or not worth it?

 

I grabbed my OBX headers from Ebay. Intake spacers are a great way to reduce intake temperatures. And the BOP opens up the intake flow quite a bit. You'll lose a little in the low end but gain in spades at the top. Also, the spacers I believe comes with a IACV coolant bypass which further drops temps with a bonus of eliminating the whole IACV shorting out the ECU issue.

 

Iacv bypass? Sorry but what part in da car is dat I'm mot so familiar with this vq

 

Everyone knows the 3.5 doesn't have an IACV :|

 

Get em all, Headers most will say best Mod for a 5.5, and NWP BOP and Spacers is the Best Dollar for Dollar for Gains....

Link from ebay, may find them cheaper....

http://www.ebay.com/itm/OBX-Racing-Sports-SS-Exhaust-Manifold-Headers-02-03-Nissan-Maxima-3-5L-V6-NEW-/171041278547?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3AMaxima&hash=item27d2daca53&vxp=mtr

 

installation costs a fortune...

 

I did it myself, always usually Sunny in Cali, where he lives, can give him a hand or there is some near him also that can help him out with the Install...

 

Depends where you go. I got quoted 300 - 900 for just the header install. And, if you have a decent set of sockets, jack stands and PB blaster, and an afternoon, you're good.

 

http://forums.maxima.org/5th-generat...-comments.html

Everything you need in the link!

 

You are correct sir. Why the hell are there coolant lines on the throttle body?

 

^^^ I believe it is for sub zero climates, so the throttle body doesn't freeze

 

Which just a joke. At those temps there's not enough moisture.

 

I've seen heaters on carburetors before...but they use a venturi effect to pull fuel out of the float bowl. The pressure drop from the venturi can sometimes drop the temps enough to freeze the moisture in the air. Makes no sense on a throttle body.