while you may consider it a PITA, as a last option is buying the Z1 headers, a new flange, cut and welding new flange on.

but then again, the 350z TP and HFC are much cheaper than the 370z ones so in fact having to use them is actually a bonus!

The HFC's that I am specifically looking at purchasing are the Fast Intentions HFC's. Their 350Z version and 370Z version are actually the same price online so I wouldn't be saving any money with those.

I know in some of the other 350Z versions v. 370Z versions thats true and the 350Z's are cheaper but I think I am going to be purchasing the Fast Intentions HFC's and CBE so there wouldn't be a difference in that case for me.

My head hurts.......so why not buy the FI DE HFC's then??

As does mine. I am not purchasing the headers anytime soon. Most likely it will be late spring 2014 when it's very possible that the headers with the HR flange will be available. If that's the case I'll just purchase those headers at that time.

Sounds good. /thread

Ive been reading here and there, and what I can gather is that unless I get LTH's I shouldn't even bother getting headers. Unless, Z1 comes out with a set of shorty ones? Then I can throw some HFC's on it and I'm good?

You cannot have shorty headers and LTH.

LTH = Long tube headers. Aka headers that are longer. Short = shorter.

LTH will bolt onto the part most consider a "catback exhaust"

With shorty headers you will need HFC or test pipes.

These headers from z1 are not LTH but so far they seem to be the best option out there for making power.

install for LTH and these are about the same except for some say that getting the longer headers up in there to bolt takes a lil more effort.

Uhh...that's what I said.

Z1 has already released "their" shorty headers. The only thing is you have to buy HFC's or test pipes for an 03-06 350z or better known as the DE motor. These headers are exact copies of the momentum headers originally made for the 350z. These have already proven gains as good as LTH's but no proof that they outperform them as no one has done a full comparison. Hell, for the labor it takes to put em in, no one ever wants to do it more then once lol.

Lol, definitely a lot of truth to that. It's easy if you have the front of the car completely disassembled though.

Oh ok. So those headers they've released can fit both the 350 AND the 370? For what I've read it looked like because it was an exact replica, some other modification was required to have it match up to the 370.

PLEASE correct me if I'm wrong. I'm looking at just keeping my car NA for now.

I just went back and re-read it. As long as I buy a HFC for the 350 it will match up to the headers. However, will it also match up to my MXP catback?

You need HFC from the DE (03-06) 350Z engine.

Nice. It looks like on the website they offer their own set of HFC's. I may just do that. Seems like a sure thing.

The only modification required to make it fit is the is HFC's/Test pipes. Other then that, the exhaust system bolts up perfectly. I had issues at first bolting it up to my exhaust but found out later that it was the TopSpeed test pipes that had bad fitment. Not the headers or exhaust. I swapped them to the Z1 test pipes and sure enough, everything lined up perfect. Found out later from 350z guys that the TopSpeed test pipes had horrible fitment even for them on stock headers and their Catback exhausts.

Thanks man. I'm about to buy both the headers and HFC's right now.

It was also pointed out to me at least that the headers if paired with hfc rather than test pipes would max at 324 hp. So on in my instance is why going test pipes in conjunction.

Sent from my GT-N8013 using Tapatalk 2

Where/what is this information based on?

I spoke to Jon couple months back and said the same thing. He also did say thay with the Tomei single exhaust, the shop car made 346whps. :)

I can't post the email from Z1 because obviously they have a disclaimer stating you can't repost however that is what I was told. believe it or not.

I'm not trying to discredit you, or Z1. You're both good people.


Just that it seems kind of odd to say that a certain setup is "capped" at a specific HP level, when we all know that there are so many variables that go into play when dynoing that it could read anything the owner would.... or would not, want to see.

:icon17:

I think it was more based on my setup of full boltons then installing these headers would cap me around 324 unl3ss I went test ipes or art. I ordered this stuff 06/5 and I believe the parts have arrived at aam but I havent picked a shop here in houston yet to ship them to for the installation. Seems like its taking forever

Sent from my GT-N8013 using Tapatalk 2

I'm looking forward to your progress, and to see just where you do end up at. :tup:

Yes, I believe these are just estimates based on their experiences. They estimated with the headers and HFCs, I could probably pull about 320whp, a few more if I had CAI, and probably 330s with TPs. Dynos obviously vary so these are just estimate on what you can expect with certain mods. It's nothing official.

WANT!!!! :yum::yum:

I want the Tomei exhaust. But they need to make a 3" Y pipe

My thoughts are what will these headers do with MD ART pipes and an FI cbe...

Cause that's my plan. I will most likely have to do HFCs due to state regulations, but ART pipes would be my desired path.

You'd be in line with me then since I have a FI cbe.

I like their headers, but I will buy only when I can use the FI RTPs. Until then, I wait =)

the horse is dead and i just punched it.

with all the interest in this thread, z1 wil def get it done with the HR flange

They had said that they would be creating headers with the HR flange in the near future. It's just a matter of when it will happen. Also they mentioned that it would be an additional $150-$200 with the HR flange version.

Not worth it IMO over a flange shape, as said before test pipes are less expensive as well...you could buy this setup, save at least 300 bucks now(or maybe more later if they raise the base price), then sell or scrap your oe cats and buy de cats if you really needed them, plenty avaliable on other forums, plus no waiting, these make power, the butt dyno told me, and the real dyno will tell me on august 13th.

Well guys my HR going into the shop to install the Z1 headers and Z1 test pipes, plus bored out throttle bodies, NST pulleys and a retune. Lets hope for better numbers.

- Manny

No need to hope. :) it should definitely make more power.

Sent from my SAMSUNG-SGH-I717 using Tapatalk 2

T minus one week till tune day!

Good Luck Joepro!!:tup:

Well guys all parts are installed and car will be tuned this Friday! OH YEAH!!!! Fingers crossed :tup:

Can anyone chime in on the sound difference between a resonated TP (such as F.I. Res TP) and the ART pipes? Or is their basically no difference in sound??
AND, coming from my F.I. HFC how much more sound will i get?

Can't decide on which one to get with the header combo D:

-Thanks

I went from CNT resonated pipes to z1 test pipes to art pipes all in the same week.... regular test pipes had ridiculous rasp at 2500 rpm but I also have a non res exhaust.... Art pipes took care of 90% of the rasp but actually mellowed out the tone perhaps a bit to much.... The resonated pipes had a bit of rasp and plently of volume....I would say all will be louder... With the art pipes being the quietest of the test pipes

Thanks for the reply man. So if i were to go ART from my HFC i probably wouldn't notice much volume change? (Performance gain of course!)
By the way, im running F.I. 12' res now (My signature is wrong now, just realized that:shakes head:)