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I'm sorry

Is the nismo exhaust with stillen headers a good set up?

stillen headers are garbage. basically just a shiny version of oem headers. Nismo or Nismo S-Tune exhaust? either way for a little more better could be had. If you arent doing the headers yourself, i would a) spend the money on a FI or PPE longtubes or momentum short headers or b) get test pipes and call it a day unless you have money to spend. Header install is probably 6-10 hours of install time depending on who does it so factor in about $100/hr of labor and it hurts. took me about 7 hours to install myself.

So what is the best hfc to get on a Z between berk and invidia?

I like my invidia pipes. I think the sound and work awesome. I think honestly pipes are pipes. I think the only thing that would make any kind of difference and no really on HP is the o2 bung. The matched up nicely and fit properly. That's pretty much all I wanted. I wish I had some headers and Looking and reading the single pipe versus one piece molded are more efficient .

Let's say I were to get hfc, wouldn't I need to do something else for the O2 readings? I've been searching on the forum and some have said that a service light keeps on appearing after installing HFCs.

Not really looking into TP.

You shouldn't have issues with HFC's at all. To keep it easy, if you get an Invidia exhaust, why not get the HFC's too? The difference between two HFC's from reputable manufacturers is going to be academic. Just stick with good companies and stay away from knock off's

IF for whatever reason you get a CEL, these will solve your problems. I didn't buy the L bend ones particularly. I bought 4 3" ones and double stacked on each side so effectively 6" on each side. CEL went off and never came back. I'll be doing the same thing once my test pipes get here.

2X O2 Oxygen Sensor Extension Extender M18 x 1 5 Bung Test Pipe Angled 90 Degree | eBay

I was wondering if you can run a motordyne intake manifold with k&n intakes? Thanks in advanced.

Would love to hear a sound bite of this set up. Im thinking about test pipes, but im worried it would be too loud ( I already have the G3 and Stillen CBE).

O2 extenders help, but you can still throw a CEL with them. There really is no full proof way of eliminating CELs with TP or HFCs unless you get a UPREV tune and close the loop to those sensors.

Guy at parts shop told me about a part like this as well... sounds like a winner but I think a tune is actually the best route. I posted a start up and idle of my set up on my profile.

shouldnt be any reason you couldnt. bolts up and sits just like the stock manifold. ill let you know since i have one on the way and im using k&n but safe to assume every guy that has it on here probably has an aftermarket intake.

http://www.importtuner.com/powerpage...sport_package/

Your welcome and I'm sure your capable of using the internet a little bit better! ;)

Ss firehawk: I'm close to getting a good deal on some stillen headers along with the nismo s-tuned exhaust. But I'm hesitant about getting the berk hfc due to the fact that it is gonna make the car a lot louder. That's why I was asking earlier what the difference was between the invidia and berk hfc because I wasn't too sure on which one to go with.

Chris: please let me know how the manifold turns out I am really interested in that mod. Also if you could let me know if there's a difference in the sound of the exhaust.

Thanks to everyone who has responded and helped me out, much appreciated.

It would be pointless to install headers and a nice free flowing exhaust without installing either TP's or HFC's. The OEM cats are the main choke point in our exhaust system.

I am pretty sure that anything you put in place of the Cat is going to make things louder. I would venture to say that a resonated pipe will muffle the sound a little bit more than a straight pipe. Depending on how many resonators you have to go through before you exit the exhaust will make the sound louder or not.... They act more as sound tuning rather than muffling though. A straight pipe is going to be loud combined with an open CatBack either way. I would get the HFC first and just try it with your stock (or look on youtube for different soundbites of different setups). I was just going to put my test pipes on with the stock exhaust at first but then the greddy fell in my lap. My car is loud as hell and there is no nice way to say that. I think a test pipe or HFC with a stock system will give you a little boost in power. The ultimate goal for me is to let the car breathe. For someone else it might be about getting a good high RPM note vs. a low rev note (so when they open it up it roars and when they are cruising in town it doesnt). Guess it pretty much depends on what your goal for the exhaust is.

So which hfc has higher quality between invidia and berk?

Either is good. I still wouldn't waste my money getting the stillen headers installed but if you really want them on. You definitely won't get a big power boost with the OEM cats on but good gawd, with headers and exhaust it does sound sexy!. Right now until my test pipes come in, I'm running Momentum headers, 350z OEM cats, and CNT exhaust and it sounds AMAZING! Real nice smooth and crisp exhaust sound. ZERO rasp since the OEM cats keep it from rasping but as mentioned, it is a power bottle neck. I'll post a sound clip later of how my exhaust sounds for now. I'm kinda sad it won't sound this smooth after the test pipes come in lol.

I heard a sound clip of a 370 w/ k&ns, stillen ss headers, OEM cats, and nismo cbe and it had a lot of rasp. Not sure if hfc will help the sound or not. Don't know too much about how all that would work together.

Rasp will be 10 times worse with HFC's if the OEM cats cant stop it.

Heres a link to how my exhaust sounds at the moment. This is with Momentum headers, 350z stock OEM cats, and CNT exhaust. I know I'll have quite a bit of rasp once the test pipes go on.

370z Rev up - YouTube

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I think they are hearing the headers too...
If the headers aren't wrapped to hell, Stillen headers make a tinny noise

Hfc's don't cause hardly any rasp if any. Remember, they still have a core in them, just not as large and more free flowing than stock cats. TPs are going to give you a ton of rasp depending on exhaust you have. I'm going to wrap my TPs and add smaller resonators on my Ark exhaust to get rid of some of it.

i had stillen hfc's and mine rasped quite a bit.......

You sure you aren't getting rasp and hiss mixed up. Because with hfc's you will get that hissing noise. And if you think you are getting rasp from your stillen cats than you are gonna love your tp's. Lol

I have the same headers you have with an Ark exhaust and TP's and it is ungodly loud and rasp like crazy.

100% sure it was rasp and dont worry, im ready for worse lol. I got the resonated test pipes on the way but we both know it wont do much lol. rasp and the noise dont bother me much. I mean hell, its a racecar right? :stirthepot: the ark is a more loud exhaust but gawd i love the ark exhaust.... wish i stuck with my gut and went that route lol. but now F.I. is in the works lol.

The M370 manifold will help with rasp believe it or not, not sure how, but it cleaned up my exhaust note. Having 18" resonators and exhaust cans will help too. I was worried with mine, but it was 99% gone after the intake manifold was installed. For kicks, I ordered a resonator for my Y pipe to play with too.

These issues have persuaded me to look into the 18 vs 12 resonators..probably will end up getting hfc and more at some point, try to keep the decibels down. :)

thats actually very exciting to hear! Ill be optioning for the 18" resonators when i order my F.I. exhaust but im quite intrigued on how the manifold reduces rasp.....engineers chime in please!

Have no idea why lol, It may have changed the velocity of the exhaust because longer intake runners? Regardless, it was the first thing I noticed when I reinstalled my stock manifold. I was butt hurt because it came back and did not sound as nice haha. Inadvertent benefit.18" resonators will give the TP's and headers a nice balance. I understand people like loud, it will be loud and aggressive without being obnoxious. MY Tanabe exhaust was rated at 93db though... pretty quiet when I'm not on the throttle. The second I tip in the gas, it opens up a serious can. I couldn't imagine LTH's/TP's with 12" or no resonators at all. I would purchase an insurance policy on my ear drums.

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Lol another one of these threads? Well I'll chip in then. I'm running:
Stillen Gen 3 CAI
FI LTH
FI CBE non res'd w/ CF mufflers
Stillen lightweight pulley
Uprev tuned

Not really any rasp (and by rasp I mean the sound of a rusty civic that's powered by an angry swarm of beezzzzzzzz) although it is pretty loud. When I go to work in the morning my exhaust rattles the pictures on the walls of my neighbors house. Luckily they love my car and don't care, I've become their alarm clock lol.




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