I've had the hissing noise for a year. I had it when I installed headers on various cars. You'd know if you had an exhaust leak.

If you exhaust is stock adding a Magnaflow 10426 should fix the problem. Read this post for more info.

https://acurazine.com/forums/3g-tl-performance-parts-modifications-112/how-do-i-keep-x-exhaust-rasping-pcds-849750/

oh yes and mangos are great.

Hey Richie,

Thanks for the info! I've already ordered the Magnaflow 10426 from a local store, but as usual, I am now playing the waiting game for shipping. Pretty confident it will fix the rasp as everyone on Azine seems to say that after the install, at least 95% of the rasp is gone. By the way, I have a Comptech Exhaust as well as your Rv6 V3 J-pipe.

I'm just worried about the hissing noise being a leak but good to have confirmed with others that it's normal with the mods that I have put on.

Should have ordered if from me. I have them in stock.

Yeah...I regretted not ordering it from you a few days after I placed my order for the gasket set. I thought since the CT exhaust has a mid-muffler, there probably won't be much rasp at all and my main problem was the leak that I was having by running the PCD + J-pipe combo with no gaskets....

So I had to order it from a local store (told me 3-5 days) and now I have to wait all over again...