I just installed a Tsudo cat-back about 2 months ago.

Recently, I noticed that when i shut the car off after I have been driving to work or whatever, I hear a hissing noise coming from underneath the car.
At first, I thought it was the bolts needed to be tightened, so I did that, but its still making that hissing noise.

Anybody know what it is or why it is doing this?

 

snakes

 

Its making a hissing noise while the engine is not running?
The exhaust would have to be melting something or there is back pressure at the cat because its clogged and you are hearing it bleed off.
But you could be a little more specific where the sound is coming from,the exhaust runs from front to back.

 

Yea its hissing with the car shut off. Sounds like its oming from the catback i just put on. By the cat convertor, down to the resonator. Cant tell specifically what area its coming from, its just hissing in that area

 

what do umean the cat is clogged? it does sound like its hissing from the cat area.