Some people don't like Flowmasters, and that is their opinon, Me I like the low rumble I get from my flows, I have Delta Flow 40 series on my '70 Monte Carlo and it sounds very good, You don't get the loud kackle from a 50 series or them old cherry bomb glasspacks that went out with beehive hair dos and going to a sock hop. If you can hear these mufflers on something, take a listen, they may just be what your looking for......Only you know what kind of sound you need for your hot rod!