Verified answer

no its not louder, its not faster, but it is cleaner cos it filters out the chemicals in gas

>> I always thought to change Catalytic Converters, but I don't know it makes my car louder or not.

The Cat Converter restricts flow. So it makes it quieter. Remove it and you get slightly more noise.

>> Well if it is get louder then I don't have to get exhaust system.

Everything that pipes the exhaust gas is considered the exhaust system. so you already have an exhaust system

Good Luck....

it makes the exhaust gasses exiting the car cleaner, but NOT! louder lol, u can get a high flow catalytic converter that will make it louder, but make sure your car would be legal in the state u live in, here in tennessee u HAVE to have cats for your car to pass the emissions test...and u have to get one here every year to get your tags renewed, but if u dont have to have them, dont worry about it, just do away with them and get a nice muffler if u want what ever u have loud, make sure its a V8 u have though, all the ricers and 6 cylinders sound like crap...i use to have a 5.0 mustand and got an off road H pipe which dosen't have a spot for the cats , just mufflers...it sounded AWSOME, but check whats legal in your state first

Try getting a steel pipe the same or just a bit smaller diameter as your caty has. Then beat the pipe through the caty until it reaches the other side. Dont make it too long, it should be just right enough to fit inside the caty. IT probably sounds strange, but it will make it louder. and it will still pass emissions.

i hate cats, get a test pipe, and when you have to echeck it, just unbolt the test pipe and slap the cat back on, and yes when you take out the cat your car gets louder, if its a stock muffler, with no cat it will sound like crap, like my supra, ive got a megan racing exhaust, and no cat and it sounds like a beast