Hi,

I installed a brand new Ark grip exhaust couple days ago and noticed a hissing/rattling noise coming from what seems to be the catalytic converter. This sound occurs during deacceleration (around 2000 rpm) cold start idle. and most noticeable when shutting off the car. I have read that it could be heat shield or a clogged converter, but i have also read that it could simply be the gasses mixing in the pipes. Or am i just hearing a rasp?

Does anybody else with the Ark exhaust have this same issue? Any input would be appreciated.

 

I have some what the same issue... I hear a slight high pitch hiss (almost like a faint blow off valve) sound between shifts (5AT) and sometimes on deceleration... I know I did everything correctly, and I went and double checked it, but for my case, my exhaust were one of the very first units sold, so im gonna assume theres a slight break in the welding somewhere under there. I just dont have the time to go under and scope it out, but I did pinpoint its coming from the passenger side.

You could either take it to a auto shop and put it on a lift, or save some money, jack the car up and have someone get it and rev the throttle while your under checking it out < not the safest or smartest thing to do, but hey us backyard mechanics need to stick together ! LOL ! just make sure you use jack stands and you'll be safe, good luck !

 

Well from the rattling sound you describe, i would check that every bolt is tight. If it was a bad weld you would notice just a hiss. That or a crack in the the pipes but you would definitely see that on the install.

 

Sounds like a leak to me. More BS with ARK. I thought everything was fixed....guess not.

 

The hissing could be normal, mine always hisses whenever I decel and mine has no leaks...but I also have test pipes. Just put your car on some jacks and have a friend or someone give it some throttle while your under your car, and pinpoint where its coming from.

 

Way to be counter productive champ

 

Rattling sounds should be from something loose, like maybe bolts i guess, cause mine doesn't have any rattling. and I think for ARK, they do not rasp, well at least for me. mine sounded deep only.
For leaks, have your car on a lift and try to feel around the pipes and feel for leaks.
Good Luck man.

 

Thanks boss! Glad to see the newbs contribute to the thread as well.

 

If all your 6000+ post are like this, then your not contributing much to the community.

 

They are. Read my sig.

 

 

Way to go Junior.

 

Thanks Champ!

 

any updates??

 

I have Test Pipes and Muffler Delete and suffer from the same hiss, i get it when the car is around 3k revs and i let it coast down, so when it slowly start to lower the RPMS i hear the hiss. I do hear like a rattle when im around 2.5 k revs, is that something we can take care of?