Just finished installing Ark's HFC onto our already ARK grip catback equipped car, the "hiss" sound is there after the install of the HFC. A little bit disappointed in Team Ark's advertising of their product, they should state that the "hiss" is lessened to an extent.

Either way Ark needs to step up on their game and explain what is going on with this product that cost a pretty penny.

Anyone experiencing a CEL with the ARK hfc's installed?

Which Ark exhaust do you have? grip v2 or the prototype?

Ark Grip before the revision

Hi im Vinh, i am experiencing the smae thing. Alex at ARK told me we just need to get a cel fix.

we have a L bend Cel fix that will remedy this issue.

Since my car got rear ended couple weeks ago and my ark grip got bent I bought the v2 and I can tell you the hiss is A LOT less noticeable like its almost not there. I was actually shocked how much less of a hiss v2 produces. I have cnt hfc and Im sure with ark hfc hiss would be completely eliminated with grip v2.

I already ordered the CEL fix off ebay for $8 a piece :tup:

You will always have hiss with the VQ engines. Some say it is the design of the exhaust and flowing more air when you add HFC,TP, or LTH. The pressure is trying to be equalized at the X,Y,H pipe for whichever design you have. The Nismo exhaust I know seem to not have it as the other designs cuz it is an H pipe. The other is when you take off the stock cats and put on the HFC's the walls on them are thinner than stock allowing the sound to escape. Whichever theory you believe the sound is here to stay. I am guessing since ARK put out a HFC stating it eliminates hiss that they used thicker walls to lessen the volume of the hiss. I would hate to know they reduced the flow of air to reduce the sound of the hiss.

I have the ARK HFCs with the Ark Dual Grip Exhaust V1 and I still have the hiss as well. It wasn't as bad as when I had my CNT Test Pipes on, but it's definitely still there. Kind of mad that ARK was heavily advertising that the hiss was gone and even when I called them they assured me there would be no hiss.

I did throw a CEL after about a week of driving with the HFCs. I went to Z Car Garage in San Jose for an uprev tune and of course it's gone now forever though. On another note, I had the experts at Z Car Garage look over the hissing noise. The guys tried to fix the noise for a couple hours free of charge because the noise was bugging the owner (the guys are awesome), but to no avail.

I have the ark exhaust with berk hfc's and I have the hiss as well

Did anyone's car throw a P2A00 ( main o2 reading too rich/lean) after installing the HFC ?

bringing this back to life. But is it worth getting the ARK HFCs? Is the Hiss everyone talking about perhaps not as bad as in other HFCs? Has anyone tried or heard other HFCs before the ARK???

I do run with ArK hFC and ARK grip full exhausts with burnt tip. I hardly hear any hiss or I just grown to love that deep growling sound of the exhausts that I would care less about it.

Worth every penny IMO.

Btw i did have CEL with the HFC but that is why you need a good tune to solve that CEL.
Been running it for years no issues with CEL on.

I have the ARK test pipes and I highly recommend them. Have had them for about 1.5 years with 0 problems. Very solid pieces and well designed. With the right exhaust (I have Invidia Gemini) you wont hear any hiss.