2.5 Header question

[3rdgen2.5s]

eBay Motors: OBX Exhaust Manifold Headers 02-06 Nissan Altima 2.5L (item 190217504287 end time May-01-08 23:44:29 PDT)

Does anybody have an experience with these obx headers for the 2.5? The 4-2-1 design appeals to me since it will had more low-mid range power and since this engine doesn't rev that high so I'm not to interested in a 4-1 header that makes upper rpm power and plus I have a 4AT so lower to mid range power sounds good to me. Any input 2.5 guys?

[vsupra123]

obx is same as xs that markspecv sells....but mark sells cheaper....

[3rdgen2.5s]

Is his a 4-2-1 design? or is it just a 4-1 header with no downpipe? Cheaper does sound better...are his like the xspower header and ss autochrome header. I just thought the obx one looked like a good alternative to the stillen header.

[vsupra123]

This is posted in the sticky:

"The Sentra and Altima CAN interchange the aftermarket header, except for certain kinds. The 4-2-1 header for the 2.5 is mainly made for the sentra and follows their underlining, so without modifications this cannot be properly installed on an Altima (this is because the brackets for the downpipe and on do not line up with the Altima and may push the exhaust back some. So if you were to go this route, I advise you get the header installed with the rest of it, and then get your custom catcback exhaust done so everything lines up correctly). However the straight 4-1 design can fit without any modifications on the Altima.
The list of companies that make a header for our vehicles are Hotshot, SSAutochrome, Nismo, Megan Racing (these three are the 4-1 design that can interchange with the sentra guys). Stillen, AEBS, Strup, DCSports (all come with a downpipe, so all except the Stillen, one (since it is specifically made for the Altima) may cause proper fitment issues unless it is modified).
*Note, you will throw a SES if you do not get an o2 simulator. For the 02-04 guys, the o2 simulator from Universal O2 Sensor Simulator works. However because the o2 sensor on the 05+ are different, I believe there is no solution to getting rid of it yet."

And my mistake, ssautochrome and XS are same....OBX is different. I doubt that will fit easy with the altima as stated above.

[doesntmatterz]

3rd gen im interested in those headers as well, did you get them? Where can I view Marks products? If Marks is the low end power header for an 02 2.5 L SL altima, I would like to get it, like, NOW>.

[vsupra123]

try do a search for markspecv or just send him a PM....I read that he didnt have any at the moment though....no harm in asking.

[S3AN GOTTI]

Originally Posted by doesntmatterz

3rd gen im interested in those headers as well, did you get them? Where can I view Marks products? If Marks is the low end power header for an 02 2.5 L SL altima, I would like to get it, like, NOW>.

fyi headers by design 4-1 is for higher end rpm power and 4-2-1 are for lower-midrange power.

only 4-1 headers are direct bolt on for our altima.. the 4-2-1 (made for the sentra ser) has the right exhaust flange, but will require a complete custom exhaust. You can't mate a 4-2-1 w/ existing/stock exhaust.

Stock design is 4-1 w/ the pre-cat attached.

[doesntmatterz]

Does marks remove the precat? because isnt the precat on our 02 altimas problematic?

[MarkSpecV]

Originally Posted by doesntmatterz

Does marks remove the precat? because isnt the precat on our 02 altimas problematic?

Yes, Basic Header only replaces the stock manifold w/ precat. Correct the stock pre-cat is known to ruin your engine sadly...

Thanks!

[doesntmatterz]

Mark you stated on another thread a preorder list has started for your 2002 2.5l header, can I get on this list? Also how much do they go for?

[MarkSpecV]

Originally Posted by doesntmatterz

Mark you stated on another thread a preorder list has started for your 2002 2.5l header, can I get on this list? Also how much do they go for?

XS Power Full Race Header pkg. w/ Midpipe & Racepipe w/ free o2 spacer - MSV

Thanks!

Feel free to msg. any ?'s