cat converter problem?

[think_7500]

i just installed the bolt on cat converter that I bought from catco. My only question is if there is supposed to be a whistle/whining type sound when i hit the gas. it is faint, but definately noticible. My dad says that it is the converter breaking in, but i wanted to get some feedback from you guys in case i did something something wrong when installing. Also, i am going to get my car smogged tomorrow and wanted to know if you guys have any tips on what if anything i should do or put in my car before.
thanks

 

[YourNameHere]

Is it an exhaust leak? Were you supposed to install any gaskets?
I've driven lots of brand new cars (therefore new Cats), and I never heard any whistling.

 

[think_7500]

i installed a new gasket that came with it.... how do i detect an exhaust leak? will there be anything noticiable? smoke? smell? etc?

 

[YourNameHere]

Usually a noise can be heard.


To find a leak, grab a towel and put it over the exhaust pipe. While blocking the exhaust, look under the car to see if you can see the exhaust coming out of anywhere.

 

[Jason94sport]

Yeah that's a leak.

The only thing you'll notice from a new cat is a smell for a few days.

 

[think_7500]

so after going back and checking the gasket (which my dad swore was good but in reality was in extremelly poor shape). putting on a new gasket, and putting my new cat back on, which was a breeze the second time (took maybe 20 minutes setup/changing gasket/clean up), I got my car smogged today and was delighted to see that not only had i passed, the NO PPM of 753 for 15 mph (way over the 501 max) and the 728 for 25 mph (barely under the 754 max that i got on my smog test only a week ago went down to 0!!! PPM for both the 15 and 25 mph.
Thanks for all those that gave advice throughout this proccess and help me pick a good cat, install it and troubleshoot the end result