I finally got my headers installed after a week of having them just sit in the floor of my apartment. The install took about 4 hours with the help of my friend who is a mechanic. The only problem we ran into was the upper rear header O2 sensor stripped its threads. It cost me $130 to get shipped over night from Japan....j/k...lol. Anyway this morning we picked up the new O2 sensor and hooked it up.

The initial thought is "Holy ****" The car now pulls so much harder than before all the way through the rpm's with 4,000 rpm's and up being the strongest. The sound has defiently increased, but coupled with the Stillen rear section it's defeintly not too loud. I'm very pleased with this mod. As far as dynoing and 1/4 mile go. I won't be able to run it at the track until I go to Florida on the 7th and I probably won't be able to dyno it until that following Monday. Anyway I just wanted to give a heads up to all of those that are interested in the headers. I'll try and put a video together asap. Until then peace.

 

Get to the track man!! Glad to hear everything went well. Now go get yourself a 13 second timeslip.

 

dyno...... hehe glad to hear u like em. i hope they show some good gains for ya man!!!! keep us informed!

will

 

Dyno it and get back to us.

 

I want headers!!!! But not for $900

 

Does the Stillen Header include the "Y-pipe" section?

 

Pretty sure that it does

 

Yes, I just don't know why they don't produce a product that can bolt right up to their y-pipes so there would be no need to buy the entire thing. On the other hand it might be changed a little so there is a need for a whole new section.

 

I want properly working headers and there's no evidence that the Stillen ones work.

 

No offense to either Studman or Willse, but I believe that both of them had too much out and not enough in. Basically they had too little back pressure. They're have been plenty of Altimas and Maximas not on the org that have made power from both Stillen and Hotshot headers, so why all of a sudden is it that these two guys cars don't. Too little back pressure. Maybe I'm wrong, but if I am, then so is 3 different mechanics I talked to; two of whom were Master mechanics and one with a Mechanical engineering degree. Not to mention the Stillen techs are wrong also. Anyway, I guess we'll see if I'm right in about a week and a half.

 

Once again, it has nothing to do with backpressure. It's the velocity of gas flow...and yes, your master techs do not know what the hell they are talking about. The backpressure part is related to two-stroke engines and the control of fuel in the combustion chamber to prevent an overly lean condition...it has nothing to do with any self regulating ECU controlled fuel injection 4 stroke engine.

 

......

 

Ahh screw it...let them believe what they want...

 

huh???

 

I just hit reply to your thread by accident

 

If stillen knew what they were doing the car would have made more power.

 

UPDATE:::!!!!!!::::::: on my header situation......

i got the hesitation TSB done and they ordered me a new MAF. went to the dealer today and the service manager was there...... he said that it seems my car has "too many mods" for them to cover under warrenty. i was like well u already oredered it and its here just let me have it and i will put it on. stragely enough he agreed LOL!!!!

i get home put the new one on take it for a drive and......... HOLY ****!!!!!!!!!!!!!!! power is there all the time and PULLS LIKE A MAD MAN!!!!! seems that the old MAFs were pieces of crap. im waiting on my power valve gaskets (which should be here tomorrow) and then i will be ready to go.

i will most likely dyno again but money is tight right now considering these headers led to more money being spent than i had planned. i honestly want to say i feel a MAJOR difference now.

will

i took the car in with all the mods listed below LOL!

 

You guys are killing me.
My cattman Y pipe is coming tomorrow. I wanted the headers but I was worried about their performance. Oh well. I maybe selling a Cattman Y pipe soon.

 

After seeing the stock headers, there is absolutely no way the new headers can make you lose power. The stock headers are seriously ugly and not high-flowing. Glad to hear you got the power you should have gotten Will.

 

You believe what you want and I'll belive what I want. I know for a fact that all three of these guys are very knowlegable whether you think so or not. First off, unless you have these headers on you car, you don't have a clue as to if they make power or not. Also now Willse is saying that the headers are now making power. Another note, I know from taking Automotive Tech classes that yes you will either lose or not gain horsepower if you have too big or too much exhaust pipes. Anyway, like I said before in a week and a half I'll dyno and then we'll see if I'm correct or not. Until then lets put this little arguing match to rest.

 

I wasn't debating the Stillen headers...I was debating the pi$$ poor technical analysis of exhaust backpressure that you used.

You can get too large a diameter pipe for exhaust/headers on N/A cars and they will suffer a performance loss. This loss is due to the loss of velocity of the exhaust gas. Having too small tubing can also have a negative impact, but this is not the case with the stock exhaust manifolds or the aftermarket headers. And since my degrees directly relate to this stuff (ME-EE-Undergrad in Hydrodynamics, Minor in Physics), I think I know exactly what the hell I am talking about.

I've designed headers for the 4.7L Dodge/Chrysler engines and am currently running them on my own Dakota with MASSIVE success (and I know this is off topic, but this info is relating to my exhaust knowledge overall in fuel injected ECU regulated street cehicles). So please, don't patronize me with comments like "Oh these Master Tech guys I know says that a lack of backpressure is the cause"...

 

10 chars

 

Couple a things if I may.
1. This whole back pressure thing has bothered me. Less has always been better up until, this point in time, with this particular model car, and this particular header?

2. Any body notice that Cattman's y pipe is a straight shot, removing the loop in the stock part--and with his 3.0 headers the loop is back in? Stillens headers are a straight shot. Dont get me wrong, I dig Brian and have several of his products.

3. How much is a MAF if you have to buy one not under warrenty?

4. Quicksilver, with your knowledge, which headers do you like, Stillens or Cattman's design wise? I am aware that Catt doesn't have them for the 3.5 yet.
Thanks in advance.

 

Finally someone else on the .org who beleives in the headers. PLEASE Go to the track like I did and prove they make power

 

so is mine...i am NOT selling my Y....I still need to see CONCRETE #'s from the headers...i would hope they give mad HP....

 

ill dyno next week im sure..... this is killing me more than its killing everyone waiting i already spent over a grand and would like to see some nice gains. im waiting on the U gasket around the power valve then its on. i doubt ill do the A/F ratio since its 100 bucks ill just get 3 more pulls. im noticing that my car is having a few problems with traction at the top of first today. guess we will have to see.

will

 

I absolutely believe that headers can work, but I really can't say which of the 3.5L Maxima headers will be the best. I have never seen them in person. I've never tested them. I need to get with WILLSE, as he is literally one town away from me. He could very well be the greatest source of information that I have. Headers can, and I'm sure, will work...but there needs to be some strict scientific information gathering at this point to distinguish the primary differences between the brands (when they're all out/made).

 

No offense, but no one as proved they make any power. Not even you and your track runs. You didn't gain any MPH. ET doesn't mean much beyond how you launched. Traps mean a lot for HP. I don't see any consistence difference in your 4 runs. Maybe with more runs you could say it... but not now.

 

ha i forgot u lived 20 min away. im down to meet whenever ..... check ur PMs.

will

 

I think its an issue with the Y section.....

 

The loop in the cattman header is to make equall length runners. The Y-pipe was made to expell the gasses faster. That's what I think. I wanna see cattman header numbers against there y-pipe.

 

hit me up too.. i'm down to meet.. i really wanna check out ur headers

 

Maybe we could all head to the dyno with Will next week. The problem is they close at 6pm... that and I have a trade show I have to be at Mon. & Tues.

It would also be cool if Dixit or someone with and obd scanner could show up.