did u finally get that tune yet? if so, do u think the headers were worth it?

didn't make that much difference on mine... cats and muffler on this car seem to make more difference... if you want real loud, straight pipes... resonated if you don't want raspy

how do u like ur headers? it seems like semtex wasnt very impressed by them, at least before he got a tune, do u know if he got a tune with his headers yet?

i think there are some dyno testing results around here somewhere... i recall they are worth a few ponies... as far as bang for your buck on power upgrades, it is definitely not the place to start, as I think most would agree... otherwise, they are very shiny, pretty, and add a bit of character to the sound (but not big db gains)... you should also be able to find sound clips in the exhaust sound clips thread... if you have the extra dough, go for it, otherwise, spend elsewhere

does it really matter that their shinny and pretty since u cant see them anyways when installed lol. did u get a tune after ur headers install? im wondering if a good tune will use the full potential of the headers?

I haven't gotten a tune yet. I'm waiting for UpRev to release their stuff. As for the headers, if I had to do it all over again knowing what I know now, I probably wouldn't. How's that for brutal honesty?

Same thing happened with my last car. I purchased some headers and had them installed and the low end torque went bye bye. It really did suck there was only a small power increase and that was above 5000rpm. I took them out within a month and my cars reponse was much better.

Not to say that headers can't make a car better but I think what has been said above is pretty much dead on for most vehicles these days.

I don't think the headers are a negative. And with tuning they may turn out to be more positive than they seem now, too. It's just not worth the installation hassle (or cost, if you're paying someone else to do it).

That's true. They may pay dividends with a tune. It'll be hard to tell though, because one would need to do a tune w/o headers for a baseline, then do another tune w/ headers to get a comparison number.

on my sentra ser spec v, after i installed my header it made quite a bit of differance. install was pretty easy too, which is to be expected on a 4 cylinder. didnt notice any torque loss and noticed a gain in hp. maybe because the stock exhaust manifold on my sentra is so much shitter than the exhaust manifold on the 370z?

Semtex
 

Thanks. I had missed this post.

Great Job.

Chuck

Wow, just read the OP. +1 Semtex. As always, great install pics/vids/info

I just sent my stillen headers to get coated.
Base line 265. intake, CBE, and cats 292.
Will post dyno after header install.(3 to 4 weeks)

Coated with what?

In for the answer.:icon17:

Yeah because you can buy them ceramic-coated direct from Stillen.

Ya, or just wrap them, eh?

This is McFly from GenCoupe.com Forums - Your Hyundai Genesis Coupe Community

Someone over on our board posted a link to this thread. I'd like to help out. If you don't find this beneficial then feel free to ignore it.

I've analyzed your Dyno graphs. I hope you find this information helpful.

Enjoy:
Why did the 370Z gain 3whp on the Dynojet and 11whp on the Dyno Dynamics?

Answer is that the Dyno Dynamics dyno wasn't done the same before and after. The 370Z continues to make more power the higher the RPM you take it. So, if you short change the car and don't run it to it's highest RPM possible, then you don't get a good reading. They have to run the car to the same RPM on the before dyno, and the same RPM on the after dyno. On the first Dyno Dynamics dyno run they ran the car to only 7100RPM, then on the second dyno run they ran it to 7600 RPM. So, since they ran the car to a much higher RPM the second time, it's only obvious that they were going to get a higher reading, and that they short changed the car on the first dyno run.

If you look at the power that was made at 7000 RPM on both [before and after] dyno run's to make it fair, you'd see that they made 305whp on both the before dyno plot and on the after dyno plot. They made no power, and actually lost power at anything below 7000RPM, in fact. That's how you should be reading the dyno plots, at the same RPM on both the before dyno plot and after dyno plot. Another way to read the a hp graph is to get better resolution of the hp plot... and this is to actually be reading the torque plots. Yes, understand a hp plot and where the gains are by reading the torque graph... and what you see is that there was a loss everywhere, except that the difference disappears at high rpms, and there is no gain/loss.

Put plainly, either learn how to read a dyno plot OR even more simply, you can throw out the Dyno Dynamics readings because the operator screwed up. RUN IT, and RUN IT HIGH!... or at least run it the same.

Hp gain on stillen headers on a 370Z, is about 10hp loss to 3hp gain, depending on where in the RPMs you are... and the gain of 3hp is only for a split second at 7000RPM. WASTE OF MONEY!

People think they know, but they have no idea.:bowdown:


Like I said, If you don't find this beneficial then feel free to ignore it. At the least, I hope I don't get flamed for trying to help out.

on most nissan motors header gains are questionable, headers are really only needed when you are matching a good set of cams, which for the 370z isnt avail yet.. but a nice custom set of headers or longtubes with a built na motor is the only time i would bother with headers...

You're not going to get flamed for trying to help out, but you could lose the condescending attitude. And I already stated that these headers are a waste of money, more than once.

I got the the headers cerimical coated. I bought the non coated headers and I having them done. I did the same thing for my 350 and the headers still look brand new.

When I dyno mine i will let you know if they made any power.
Im at 291.RWHP with the cats, intake, and CBE. The engine was run to 7500 rpm.

just out of curiosity, what kinda dyno is it?

x2 with the condescending attitude...not needed here :shakes head:

Its a dyno jet.

Semtex, would u say that the stillen headers are lighter than the stock ones cause I looked at the stock headers and they looked really flimsy....

Yes, they're a lot lighter.

Man, you're fast....

Thanks for clearing that up, great set up by the way....

Resonably old thread but FYI, when I return from this business trip I will be installing a set of Stillen headers, my set up will be (exhuast wise) STILLEN coated headers, FI HFC's, EBAY Y pipe, self opened/gutted/straight piped then re sealed muffler.
Ill report back and stick up a vid or two.

I beleive Semtex should be having his headers up for sale, if he didn't sell them already, being that he now has the FI LTH'S!!!! One lucky MF!!!!!

are the intakes good for daily driving in the rain?

Reviving and old thread but looking for some answers as headers seem to be my next purchase.

Semtex, did you ever redyno with the stillen's after a tune? Thanks.

Not sure I understand your question. A tune is done on a dyno, so you're doing both at the same time.

Ya. Sorry bout that. My eyes were going crossed from reading so much on headers. Did you ever returned after the stillens to see if you got better numbers?

^No, I don't believe so. It's been a while. I don't even have my Z anymore.

Edit: Just remembered -- I switched over F.I.'s long-tube headers after these and did a re-tune at that point. But there was no re-tune in between.

I just tackled the Stillen Header Install, it took myself and a buddy a full day, i would say 10-11 hrs. It is a PITA, however it is very doable, i wanted to not even start after hearing all the people on here complain like grade school. but im glad i did it myself, saved a lot of money.

To clear it up for anyone else who is curious:
I used the stock gaskets, they are metal, and will do fine.
yes the passenger side is waaaay easier.
You will want a bunch of swivel/ 14mm socket combos
i only used 14mm 10mm and a 12 once or twice.
get a set of rotating-ratcheting wrenches, life saver.
And wear a damn glove.
i by no means am a mechanic, if you can take your tire off, you can do this.

Glad to hear you got them on, hope you enjoy them :driving:

thanks man, i really like them, gives a deep growl under stress.
i have to dyno it soon...to see real results

Has anyone who has installed Stillen headers, weighed the stock manifold and the new headers? By calculating from some answers on the weight reduction thread, I've got the stock headers at 16 pounds for both. On this thread it was mentioned that the Stillen headers are lighter, but the actual weight wasn't given.

anybody selling there stock exhaust manifolds?