i went from a 2.5" flowmaster knockoff obnoxious loud system to a 3" system using a large caSE DYNOMAX SUPER TURBO MUFFLER (#17793). man was the car nice and quiet. i could talk to my passengers,hear the radio and not get a headache while driving it. still had a nice deep tone behind it too. i'm sure if you look into it they probably make a large case 2.5" muffler like it..
