i was talking to my dad tonight and he heard if i took my cat off of my 1999 Dodge Ram 2500 it would badly affect my gas mileage. i was just wondering if that was true

no it wont i dont think but u will wanna put a simulator on cuz it u dont there are sensors there and will make ur check engine light come on if nothing is there.

If you don't put an oxygen sensor simulator in, it WILL make your mileage go down. Your mileage will go down because the computer will richen the fuel mixture when it sees that the reading of that sensor is off.

how loud would this make the truck if i took the cat off and left the muffler on

i think it might make it rumble a lil more i doubt it makes it loud. but i am not an expert.

i cut mine off and it didn't effect my gas mileage and i didn't need a simulator. But thats wa just mine, every truck is different.

did it make it any louder

It will get a little louder, but it won't be anything to write homea about.

if your lookin for higher performance.. dont just lob the cat off... replace it with a highflow cat... save our lungs and the planet!

you may loose some backpressure by removing the cat. that backpressure is what helps to build low end torque (my opinion) and helps with low end power, which in turn helps with mpg.