HEADERS?

[ZeroAltitude]

Man, it looks like I could just shop Stillen and not worry about anything else :p

[rjdmmfl1]

To the OP, as i mentioned in another thread, SPEED FORCE RACING is willing to a HEADER for the 3.5, someone just needs to be the guinea pig for its development!

[Stumpjumper]

SFR needs to do one for the 2.5

[ADKSaad1387]

UUHHHHHHgreed

[dldjros69]

A header needs to come out soon. Im sick of waiting for parts.

[Mr_Coupe]

SFR needs to do one for the 2.5

stillen is already doing a 2.5 headers read the rest of the thread so if sfr wants 2 do the 3.5 let em do it.. anyway.. someone be a guinea pig for SFR!!!

[ADKSaad1387]

yea STILLEN is making them for the 2.5's but if more companies produce them, then prices will decrease.

[Mr_Coupe]

very true however i think the 3.5 should also get them id rather have both the 3.5 and 2.5 to have them rather than just the 2.5.. i doubt the 2.5ers are th only ones that want increased HP

[ADKSaad1387]

thats true. whatever it is, the more options the better!

[Stumpjumper]

Never s

very true however i think the 3.5 should also get them id rather have both the 3.5 and 2.5 to have them rather than just the 2.5.. i doubt the 2.5ers are th only ones that want increased HP

Never said they shouldn't, I'd just like to have options

[dldjros69]

bump - i wish more updates would be rolling in.

[Stumpjumper]

We're getting lots of posts of "This part is in the works" and then no updates. It makes me a sad panda. The worst part is, I can't find some of the parts listed for the QR25. I've looked at some message boards, and they talked about a intake manifold, but I can't find any info about clearances with our hood, much less made for the motor at all!

[JDRosenberg07]

Bump for info

[dldjros69]

We're getting lots of posts of "This part is in the works" and then no updates.

ahhh it makes me so maddd

[EzeebMOS3]

I know stillen come on!!!!!! Atleast get a Y-pipe out soon! It takes no time at all to make

[Flypinoy457]

Besides the headers, anyone have any insight on a possible fuel management system for our car, something like a simple piggy back like a Apex'i SAFC. Having a header and exhaust will do a number on our A/F ratio, most likely run rich since the stock MAF will just try to dump as much fuel as it can to compensate for the more air flow.

[AltiCoupeDriver]

I know stillen come on!!!!!! Atleast get a Y-pipe out soon! It takes no time at all to make

Well, I remember spockrock saying that some company has a y-pipe in the works. However, I do not remember him ever saying which company. It seems like a good mod that should be pretty cheap, the only issue is emissions.

[JDRosenberg07]

Besides the headers, anyone have any insight on a possible fuel management system for our car, something like a simple piggy back like a Apex'i SAFC. Having a header and exhaust will do a number on our A/F ratio, most likely run rich since the stock MAF will just try to dump as much fuel as it can to compensate for the more air flow.

Well the MAF sensor is located on the intake before the air even reaches the engine. So exhaust and headers wont really have any effect on your A/F ratio it just helps it "exhale" easier... Even if it did tho the ECU will compensate and still use the right amount of fuel so you dont run too rich or too lean. Thats the whole point of havin it there.

[EzeebMOS3]

We'll you could just put the stock ypipe back on before you went to get your emmisions tested....that's what im planning on doing..... I'm just gonna cut out the third cat and have a pipe put in, however keep the cat and just clamp it back on before i need to go for the test (every two years i believe). Unless a ypipe mod comes out soon, than ill just bolt that on and do the same process.

[dldjros69]

Stillen what is going on? Update us please

[dldjros69]

We are almost finished with our headers for the 2.5...These are coming along very well and should be available within the next 60 days. The initial design and testing will be finished in the next week or so.

well before i get madd at stillen, it hasnt been 60 days yet.

[Robs_altima]

We'll you could just put the stock ypipe back on before you went to get your emmisions tested....that's what im planning on doing..... I'm just gonna cut out the third cat and have a pipe put in, however keep the cat and just clamp it back on before i need to go for the test (every two years i believe). Unless a ypipe mod comes out soon, than ill just bolt that on and do the same process.

They should only look for a check engine light and run it through the computer. If someone wants to really get specific with you, the primary cats should will still be on the car. They're the ones that do the all work and tell the computer whether or not you have a working cat on the car or not.

As far as the MAF, you guys are right, nothing should change. It's a 4 stroke engine, a free flowing exhaust should only help to keep the rotating inertia of the engine up by reducing the force needed to push the air out of the engine (in theory). The only down side is less back pressure will only hurt economical driving but the gains in wide open throttle acceleration should more than compensate.

[EzeebMOS3]

Headers just for the 2.5 4???

What about us 3.5 V6'ers!?!

[kyle@stillen]

Hey Guys,

So, we had a new products meeting today and I mentioned a few new product ideas. Since STILLEN will not be developing headers for the 3.5 liters I decided to ask about high flow cats. Then our engineers told me that the cats are built into the factory exhaust manifolds (NISSAN likes to do this.) Which means that if you're going to attempt to do HFC's then you need to go ahead and do headers as well. So basically to do either headers or HFC's on the 3.5 liter's you're going to be looking at spending around 2K with installation. You will get the header and B-pipe/HFC.

Now here's the tricky part...Because of the short term fuel trim monitoring on these ECU's you will more than likely set off check engine lights with high flow cats. This is something that we are currently battling on the new cars. It's not easy and O2 emulators don't always work. We're trying spacers on the sensors to pull the O2 sensor out of the exhaust stream but there are no gaurantees. Also, I'm sure someone will mention "just use spark plug defoulers." This also doesn't always work...

Moving to the 2.5 liter headers. These are being tested right now and so far things look good. Right now we just need to give our engineer's some time to drive the car and get some miles on them to see what happens with the short term fuel trim and sensors. Basically make sure they have a fix for any check engine lights if it needs it. I should have more information shortly.

[JDRosenberg07]

Thanks for the update kyle. Cant wait for them to come out for us 2.5ers.

Quick question tho.. What do you mean by, or what is, "Short term fuel trim"?

[EzeebMOS3]

Would we (3.5ers) experience any problems removing the third CAT?

[AltiCoupeDriver]

This really isn't a mod friendly car is it. What do you guys say about a y-pipe or does it fall in the same dilemma?

[adidas2go]

Nice job Kyle. Way to keep up on the new alti products

[Hussain]

this has been discussed already (maybe even in this thread) and the answer is no you wont have any issues, ive taken mine off before and got no check engine light or anything

[Robs_altima]

[

This really isn't a mod friendly car is it. What do you guys say about a y-pipe or does it fall in the same dilemma?

Problems wise, Hussian is right, it's been covered repeatedly in this topic.

Performance wise, it should shift the power curve just slightly to the right. Imagine pushing near the incline on an elastic mold in the shape of a hill, the lower end where you're pushing will go in a little but the result will push more material to the top. Same can be said about the power curve. This is the way we tune the exhaust. Doesn't always work the same

Modified Magazine installed headers and high flow cats on their G35 (VQ engine) a few months back. I believe they installed the headers first and lost power in the midrange making a bit more on the top end. It wasn't until they put the high flow cats on when they recovered the lost midrange and added again to the top end.

The car is good for mods but within reason. The stock 270hp is quite a bit, don't be surprised if whatever you gain out of normal mods bores you.