not sure how they sound with a mod motor car but i had a set of dynomax race bullets on my 90 gt they were amazing. i had them dumped and got almost no drone. They sounded alot different than any other mustang around plus they were cheap like 30 a piece. One other thing to note as well, what ever dumps you go with when you put your turn downs on make sure you angle them a little. if you point the exit straight down and happen to pull in a gravel parking lot all that dust wil blow out from under your car and end up on it. lol yeah i learned the hard way.