Exhaust sounds wierd, Any ideas what this may be? Options

[Tweek]

I recently had a new exhaust system put in from the cat back. I mentioned it before about how the guy told me that the cat was connected to the header, and someone said that we have two (one connected and another regular one). So, I have'nt put it up on a lift yet to check it out, but thought that he may have just taken the second out.

The problem is when the engine is cold and I start it up, the first couple times I hit the gas I hear this sound coming out of the back that is wierd. Its kind of a crackling, clicking sound. Hard to describe, but maybe something like the sound a stun gun would make. It goes away after a couple revs, and only happens after the engine is cold.

It dosen't seem to effect the performance at all when it does it. Any ideas what this might be?

[Hanyo]

if you remove your cats. then you will have better exhaust flow, but you will not pass smog.

what most people do is have a custom exhaust all the way up to the cats back, and then have an exhaust shop make them a test pipe.

what a test pipe is is a pipe that connects from the header to the cat back exhaust allowing you to run your car without the cats. And when its time for an smog check, you remove the test pipe and install your cats back on to your car.

But driving a car without the cats are illegal, so some people gut our there cats so it has better flow, and have the appearence of having cats. but you will not pass smog with this approach..

Its up to you whether you want to have the cats in your system.