Awesome video! That combo sounds sick! It's hard not to seriously consider the Invidia at that price point. Decisions, decisions...

resonated test pipe is here

CNT Racing

http://www.erzperformance.com/v/vspf.../370z-NC-2.jpg

What's the tubing inside diameter?

2.5 inch piping

new shipment of HFC and test pipe came in today.

only test pipes are in stock.

HFC back in stock

Hey guys, I just got my ERZ HFCs installed this morning. The exhaust note sounds good but there's a rattle. Sounds like it's coming from the front near the exhaust manifold. You can hear it when you're outside the car or with the window open. It's not as noticeable when the windows are closed. All the flanges fit fine and bolts are tightened properly. Bluestyle, is that what you describe as hiss and rasp? I would describe what I hear as a rattle. It's getting annoying. Anyone else notice this?

Na dude, the rattle is not normal. I would define the 370z 'rasp' tone that meny people remark about as a way to describe a somewhat harsher sounding exhaust note. The rasp occurs during hard pulls at open throttle.

Did you install this your self or did a shop do it? Do you have a CBE or is it still stock?

The dealer installed it for me. They had installed a few Berks HFCs and a Stillen one before, which was why I went to them...they have experience and no problem dealing with that demon bolt. I have the same setup as you (G3, Invidia Gemini and ERZ HFC).

I have a rattle as well after installing my HFC. Seems like it's coming from the HFC when I hit 3K but thought it was normal.

Wiggy

Which HFC do you have? My rattle is there throughout the whole RPM range.

Could you get a sound clip so I could hear it?

Here's a youtube video I quickly shot tonite. The audio quality isn't the best and it can be a bit hard to discern the rattling. You can hear the rattle dying as I shut off the engine at about 0:39.

In case it doesn't imbed:
http://www.youtube.com/watch?v=IgY4M2gaN0U

Aww man...that is definitly not how the car is suppose to sound.

Upon deceleration of the 370z, with hi-flow cats, the car makes (around 1.5-2k) a very quiet hissing sound. Mine do it but its very slight and I can only hear it when the windows are down and when I am going from 15mph down to 5mph. What is weird is that your sound is similar but WAY louder (like 60db). I really wonder if there is something wrong with the comb in the cat.

I would get some more imput from other members. Why don't you create another thread with a catchy title and see if you can get more people to comment. I fear to say though that you may have to contact ERZ and get them to send you another set :( They have really good customer support so I would give that a shot.

Did you have the exhaust on before the ERZ's were installed?

Oh and btw...you need to get a Cobb AP and contact Altered Atmosphere to get a tune. They might be able to give you my tuned map since you have the same setup. The tune is freekn unbelievable. Have you seen my thread on the tuning section - http://www.the370z.com/tuning/15435-...ome-gains.html

Thanks for listening to the clip and expressing your thoughts, Bluestyle. I crawled underneath tonite to see if I could find something, and I did...the problem is simple...the caps to the secondary O2 bungs (at least I think that's what they're called) were loose. The left one was half unscrewed and both were easily screwed in/out by hand. The technician obviously didn't pay attention to make sure everything was secured. Tightened those and went for a test drive, and man does the exhaust sound sweet!!!! And, of course, no more rattle!

Yes, I had the Invidia exhaust installed before. Ran it for about 600 km before the HFC install. I definitely want to get my ECU tuned...likely Cobb AP. That would be cool to get the same map as yours, since we have the same equipment. I read your other thread and 25-30 HP and lb-ft gain after the tune is crazy awesome, man! I wonder if I should get an e-tune from them or even a dyno tune somewhere to get the most gains (as each car could be slightly different, we live in different climates/altitudes, and buy different gas)???

Also, thanks to Nissangeneration of ERZ (forum sponsor) for suggesting that I should check the O2 caps. If anyone else is interested in a set of ERZ HFCs, definitely fire him a PM.

BTW, 250 km so far and no CELs.

great, I was thinking that was the problem, that 02 cap was not tight enough.

Oh sweet...I guess I just assumed that making sure the O2 sensors were tight would have been something they would have done. (Wish there was a 'slap upside the head' icon that I could direct toward your mechanic)

So glad you didn’t have bad cats though. That would have sucked to have had to rip them off and re-install.

Yea, your right about the tune…you do have different altitude and gas. You’re probably better off going to Cobb directly based on where you live in Canada. Looks like you are half way across the world from Altered Atmosphere : (

this exhaust fits on my 09 nismo?

your setup sounds awesome man!!! im gonna be brave and bite the bullet on getting the ERZ resonated testpipes to mate up with my agency power exhaust. so ill have a video of the setup as soon as i get the testpipes in. i just hope that its not crazy loud or raspy,....but eh, what can i say im kind of asking for it purchasing testpipes :icon17:

After seeing your video and the price tag associated with this setup I am EXTREMELY close to pulling the trigger on this setup soon. Saving money with these results are enticing!

It's definitely an awesome combo!

I just bought the same combo and it should be here this week:happydance:

How did you find the exhaust note after the HFC were installed?

It just purrs! Exactly as Bluestyle described it. Nice deep throaty tone...just how a sports car should sound. Louder and richer than just CBE alone, but mostly when gunning it. Not much louder when cruising. I find myself driving with the windows rolled down most of the time just because it sounds so good. :tup:

glad you like your HFCs .

when installing your ERZ hfc did you guys use the factory gasket between the cats and y-pipe?

Yes.

I am just wondering because I have this vibration when I installed my ERZ hfc. It vibrates the whole catback system. :ugh2: Pressing the accelerator pedal and as soon as you let off the gas the whole exhaust system vibrates. Evrything has been tightened up good.

Does it vibrate all the time or intermittently? I had a vibration that was constant no matter the RPM...if you read my earlier posts from a couple of weeks ago, you'll see I found my rattle was caused by loose O2 caps. Make sure those are tightened. Do you have the stock exhaust? If so, make sure the heat shielding isn't loose or coming in contact with anything else. If the connections (flanges) are seated properly, bolts tightened and there's no exhaust leak, then they should be fine. Is any part of your exhaust contacting other parts of the car (e.g. sway bar)? Just a few ideas...hope it's an easy find and fix.

it is not constant. as soon as the rpm drops down that's the time it vibrates. the whole catback system is shaking like crazy. I have Invidia Gemini installed last week and I don't have this problem at all.

you should still make sure the (2)02 cap is tighten enough because I only hand tight them before I ship it , also the cel fix bung is two piece make sure the second piece is tight also because I also hand tight that only before I ship them.

only these two piece can move and screw on.

if after this don't work you might want to consider stronger exhaust hangers.

So I was thinking this weekend about how people talking about this exhaust being a little more restrictive when compared to other exhausts on the market. Allowing it to be a little quieter but in return producing a little less gains.

But then it hit me.

As the first breathing part put on the car yields the most gains; then wouldn't pairing this exhaust with hfc's somewhat negate the smaller gains made by the exhaust alone?

There are dyno's on the forum showing huge gains from HFC's and then small from CBE because of the order they were put on, and then the same reversed.


So with HFC and this exhaust put on I'd assume that the restriction is moot when put up against the gains over other exhausts paired with HFC's that are said to be less restrictive.

Please correct me if my thinking is wrong.

I am going back tomorrow to the shop to check everything out again one more time. the "cel fix bung" the o2 sensor won't fit on that extender that's why I didn't use it.

I didnt use those extenders either and mine was fine.

Same here.

this exhaust fits on my 09 nismo?

What is the best option for my Nismo, the Gemini or Fast Intentions?

I'm looking for a louder exhaust and more power.

Thanks,

Wait for my 370z exhaust.

I thought the exhaust was more for sound within an NA application. Turbo applications gain big performance improvements.

Could someone verify/educate me about this?

OP: Great post! You've solidified my choice to stick with Invidia exhausts with my Z.

You'll gain somewhere around 12-17hp at the top end with an aftermarket CBE.