Stillen headers / hi flow cats
 

Hello guys, I have a couple of questions. I was thinking about buying the stillen headers and high flow cats. Are they really worth the money? The only thing I'm worried about is if I buy the high flow cats and they trigger the O2 sensors and my check engine light stays on, how do I get it off? Also, any proven dyno results in HP and TQ gains? Thanks for the input!!

The headers are a waste of money. Most HFCs don't trigger a CEL. If it does, a tune will get rid of it.

Why exactly are they a waste of money? And okay cause I was going to get it tuned anyway

They don't make power. If you're going to spend a fortune in labor to install headers (which are very good from the factory) you want long tube headers which preclude you running any cats. Long tubes are the only ones that make power. To make it easy, buy HFCs, Stillen Gen III intakes, your choice of cat back and a tune. That's pretty much the standard setup.

I already have injen SP series dual cold air intakes, and a borla CBE , but I don't want to get long tube headers which is illegal in the state of Missouri. And I don't doubt you, but how do you KNOW exactly that they don't produce any power? ( I also really like noise which is another reason I wanted them :P)

Because members have installed them and made very little power. Headers are not cheap to install. If you want headers that make power, buy long tubes. The VQ37 comes with very good headers from the factory.

Okay thanks so much for your help, I really appreciate it, are there really anymore mods to do though? Not anything major such as turbos ect?

:iagree:

You're pretty close to having all the bolt ons. You could always take the plunge into forced induction, but that cost snowballs in a hurry. Either be happy with ~325 whp or so, or spend $10-15k+ for 500whp. There's not really a middle ground.

There is still the Z1 shorty header ( Momentum copy)
which proved some great gain....

If not then I would go for the PPE LTH , you can still get the xyz Y-pipe from Motrdyne if you want a cats.

but seriously I wouldn't go with a stillen header at all since its not much better than OEM... I bought a pair of these in the very beginning when there wasn't much option and I did regret them !

Truer words never spoken. I'm at that maxed whp with intake, HFCs, exhaust and a tune. Starting in the next week or so I'll be dropping the first of that $10-15k Chuck speaks of.

If it's noise you want the car will have plenty of exhaust note once you go to HFC. Let me recommend the Berks.

Hmm, why the berks? I've heard plenty of good things about the stillen HFC's?

Xyz pipes, are they similar to long tube headers, but you can fit stillen/berk HFC's?

To me they sound the best and I was pleased with the hp gains.

Or I would even look into the Fast Intentions HFC's. Either Berks or FI is what I would do


Sent from my iPhone using Tapatalk

Okay thank you! I'll look into it, got a youtube vid of the HFC? If so could you paste a link, and if not thank you for your help! Any particular reason why you don't recommend stillen?

I don't have a link off hand but I know there are plenty on YouTube. The reason I recommend FI or Berks is due to sound and performance. I've heard both in person and really liked them. Plus I would say that they're probably the most popular as well. Do a search on both on here and you'll read lots of positive reviews


Sent from my iPhone using Tapatalk

Berks are 200 cell count and have proven to not fall apart. The Motordyne XYZ y pipe is just that, a Y pipe that gives you the option to run either straight pipe, resonated or with a HFC. Unfortunately, it's not compatable with your exhaust. If you had an exhaust that used the same mount points as stock and is a Y pipe design, it would be G2G. I second PPE's if you want the best. The Momentums are the only shorty I would buy. If you are dead set on having headers, want to keep your existing exhaust, and run HFC's, buy the Z1 (Momentum) headers and HFC.while you are at it, just buy their whole power mod and call it a day. You will get a healthy increase in power. Just don't say we didn't warn you on the install, it's terrible and cost of labor is running about $800.

Okay so get z1 headers and berk hi flow cats? And they are compatible with a borla CBE?

You can only use 350Z DE HFCs with those headers. So it's best to just buy them both com Z1. Send them a PM and also inquire of their power mod. They have some threads too about it. Just do some digging.

Okay thank you! But I'm not going to lie, I'm kinda dead set on the stillen shortys, and stillen HFCs, or berk HFCs, and those z1s are kind of pricy lol :p.
But thank you for the help, I'll look into it and pm them and see what can be done, thanks!

The Stillens are crap. The merge collector is garbage. It looks like a Chinese knockoff with the Stillen name etched on it. You will be lucky to make 5hp. Those Z1's will clear 20+. Save up and do it right the first time

Sent from my HTCONE using Tapatalk

Agreed! Steer away from the Stillens. If you want a shorty go with the Z1's.

Why do you want the Stillens so bad? If you do a search you'll find quite a few complaints on them

Because they're a good (name brand), I don't know much about this stuff and I have a budget, honestly now I'm just thinking about goin with berk HFCs and that's it, and the z1s have to have the 350z cats or somethin like that according to ss fire hawk , that's the only thing that's compatible.

We're just trying to help ya out. Just from past experience of prior owners there has been a lot of unsatisfied people. The majority of people are looking for big gains and unfortunately that one doesn't provide it.

Yeah he's correct. If you get the Z1 headers you have to get their HFC's or test pipes but the performance that you get is awesome and it's well worth it.

It costs a lot to put these on so after the cost of the headers and labor, the end result of HP gain isn't there. Just trying to save you the trouble.

I would suggest keeping your existing headers and getting the Berks or FI HFC's.

Okay I like that idea :), so I live in Missouri and I'm going to drive to JOTECH in Texas and have them tune my car, with the uprev, and that is a definite, so you think just keep stock headers, get some HFCs, and get it tuned?
And yes I know you guys are just trying to save me the trouble if most people are unsatisfied!

Just get cats and a tune. Why Jotech? You've got to have plenty of closer places that are just as good. Hell, I'd get an Etune directly from Uprev before I drove to Jotech.

Nothing against them but that's a long drive and there's only so much you can do on a NA tune. There's not going to be a huge difference between driving to Dallas and getting an Etune other than a whole bunch of gas money in your wallet.

Because I want to go to texas to visit family anyways, and I can't find any places that do uprev around me. And yeah it's a pretty long drive! Any way you could post me a link of the berk HFCs? For my 2011 nismo? Because I'm seeing things that are HFCs but then say test pipes?

If you're going to be there anyway, go for it.

Bleh Jotech.

Yeah, but for a NA tune they're all going to be 99% the same. There's only so much you can do. Adjust the fan duty cycle, turn off any CELs, tweak the throttle response, and squeeze out a few more hp.

Here's the cats- https://www.berktechnology.com/produ...tic-converters

Like everyone said regarding headers. Maybe get z1 intake manifold . When are you going to jotech? Maybe we can get a group tune discount

You could always get the Motordyne M370 Intake manifold, then you would have every bolt on possible. I would say go with F. I. HFC's over the Stillen. As mentioned earlier labor is not cheap and you are looking at $100 plus an hour and supposedly it will take around six hours to replace your headers.

Probably not until around May, towards the end cause I graduate on the 23rd :), and haha maybe!

I'm headin to texas anyway so, but yeah I got a place that does it for 60$ an hour, but thanks! I think I'm going to stay stock!

Yeah I know, thanks for the help!

:tup: That is a hell of a deal.

You typically get what you pay for. The going rate almost anywhere is ~$100/hr, I'd be weary of $60/hr labor.

We'll I don't live in a big city and the shop that's going to do it, I've known the owner for about 7 years, and he does really good work!