issue & rasp after ART pipes
 

So first thing I noticed after install was the hollow metallic sound when stepping on the gas full throttle. I just assume this is normal when switching out from a cat.

the second thing is that there is clearly an audible hiss sound when letting of the gas. I thought I had read in other threads there was no rasp/hiss with these pipes...if I would have known there was I wouold have just saved the money and bought straight test pipes.

Third is that when I stomp on it in first, there is something making a noise from underneath the car. I did not cut the bolt on the driver side per instructions, so I will assume it is that hitting on the top of the test pipe.

so i got under the car and saw that the heat shield on the driver side was making contact with the test pipe at the elbow. i simply made a cut into the heat shield and bent it out of the way, problem solved.

I still have the very metallic sound when accelerating and the hiss when letting off the throttle. Is this normal with ART pipes or will it go away after the pipes break in and get some carbon built up?

The only way to get rid of that metallic sound is to wrap it in header wrap .. I had the same issue and after the wrap problem solved ..

I'm interested in picking a set up (switching out my hfc's). How do you like them aside from the issues mentioned?

There's hiss with test pipes. There's hiss with art pipes. There's a bit of hiss with HFCs.

It's an inherent characteristic of opening up the VQ37. As far as a metallic sound, is there any way you can take a video?

i can try with my iphone to record the sound

As far as is it worth it...definetly, the power pickup is awesome. if every mod felt like this I would be a happy camper.

my mchanic said the sound im hearing is coming from the y-pipe...i dunno, i'll try the exhaust wrap

+1..

Y-pipe, are you running the stock exhaust? I have the art pipes and invidia exhaust and am not experiencing any of these issues. The hiss as everyone will tell you will always be present, however after a few hundred miles I do not hear it as much on decal as I did when first installed.

I have ART pipes and I only here it hiss when it cold (in the 20s), but I have no hiss, drone or rasp with either the stock exhaust or my current AAM dual exhaust. I went with ART pipes specifically to minimize rasp and drone, but hiss, I didn't see it as an issue. As everyone said...TP hiss.

My ART Pipes and F.I. Exhaust hiss, but only under deceleration. I think it sounds neat to be honest.

That's the same setup I'll be going with, how you liking it overall?

I called a shop today (Lutz Performance in Tampa, Florida) and they wanted $200 to put exhaust wrap on the test pipes because they said they would have to take the pipes back off in order to wrap them. I asked why and they said "how else are you going to get the exhaust wrap roll around the pipes"

I said I would just do it myself.

Is 2" exhaust wrap too wide for the bend in the test pipes?
And is 15ft enough for both pipes?

I found this: http://www.jegs.com/i/DEI/186/010129/10002/-1?sendroicid=bbef8492-2d00-41d6-b158-38db0de2603c&catargetid=1716046196&sendroikwd={key word}&gclid=CJHR0cCB37QCFRQcnAodfQcATw

2" is fine and 15feet if done correctly will cover 1 of them.

Lol lutz performance

I have not one complaint. Great sound and good performance combination.

:iagree: X2

My ART pipes have the metallic sound under acceleration too, but I just figured it comes with the territory. It sounds more like gravel in a tin can to me.

yeah, thats it. maybe after I have them wrapped in this stuff the sound will be more pleasant: DEI 010129 DEI Titanium Exhaust Wrap

That doesn't sound anything like mine, mine just sounds like someone saying, "Shhhhhhhhh"

Honestly, after I read your post I was thinking "no way would this ever work". Well, I bought some wrap and hi-temp silicone spray and went to work on my test pipes since the rasp was driving me crazy and at this point I would give anything a shot. Now, it didn't eliminate all of it, but I would say rasp is down by 60%. Thanks a lot man for the tip. Rep coming your way :tup:

Just installed Berk Test Pipes and I get the same hiss. Don't know about a "metallic" sound, though

I installed exhaust wrap on the test pipes, and I still get the hiss during decel (around 2500rpms) and when I floor it, it still sounds metallic-y

I'll trade you HFCs and cash for them

I had hiss on art pipes with fi cbe too.

Now that I'm running the motordyne cbe with art pipes, no more hiss that I can hear

Anybody go from just E370 to E370+art pipes? How much louder does it get? I don't mind it at all right now just don't want to make it annoying.

Just installed my ART's... LOTS of rasp.. Saving now for the FI cat back with Res.
I'll post vids later.

370 z ART pipes with factory catback: http://youtu.be/Vnui7mdEb-Q

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I had ARTs with FI and no metal sound. Car just constantly went SHHHHHHH WHEN I'd slow down.

I liked the combo. Went with FI LTH over the weekend and wish I had just bought them from the start.

The power and sound with the ART's was nice, with the FI LTH...10x better.

Count me in when u decide to sell those art pipe.


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I'm keeping the ART, just going to add the FI cat backs to it

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Vids are set to private :(

OEM Y or aftermarket with larger diameter pipes?

If the latter, yep... it's the Y's.

It is VERY hard to change anything on the exhaust side of VQ37HR without at least some rasp or hiss.

Best combos I have found thus far in terms of very minimal/negligible rasp or hiss are either Nismo S-tune + resonated TP's (although the S-tune exhaust is really not that great for power and the Y-pipe was prone to cracking...) or PPE LTH + Nismo take off exhaust (the one with the H-pipe).

May sound like a dumb question but did your mechanic check to make sure there is a solid connection between the Y pipes are Art pipes and that the gasket is sitting flush? Possible excess vibration could cause it.

We've had problem with a customer's car here because the Y pipe bolts was cracked between the flanges. It wasn't leaking however it was vibrating.

i have a 2010 G37S and my ARK HFCs (look exactly like art pipes) sound great but do have that annoying metallic sound when i floor it around 3-3.5K rpms. no hiss and sounds great on decel and everything else

One suggestion to minimize any rattling would be to make "washers" out of some heavy duty rubber hose -- like intake coupler hose -- cut two pieces, and figure out a way to mount it where the TP's contact the frame. The rubber will cushion the vibrations and quiet them.

This may or may not work if that OEM cross member that went across the OEM cats was removed... the trick will be finding a place to secure them where they won't melt against the pipe...

It might be a little off topic but are these illegal? can you get a fine for having them?

Any removal of factory emmisions is illegal. BUT.. in Texas, as long as the emmisions test only consists of the OBD scan you're fine, assuming your MIL is not on. Not sure about other states

Sent while driving!