I'm not sure what kind of car i would put this on... but i know it wouldnt be mine.
I have a 3in hiflow cat and that quieted my car down some (til the ewg opens anyway) and it made it sound deeper - where before it sounded snarly and mean... so if u want the car quieter just get a cat (i got a cat because i need it to get my car registered as a collectible - must meet certain amount of emissions regulations
)