I just got an ES Muffler W/ a 18" magnaflow Resonator 2.25 in piping from the cat back an that shit is quiet as hell i don't here anything till about 5000-6000 rpms when I am pushing it hard...... as for driving around town I hear nothing. It might change next week when I put on my ITR header an carsound cat I know I will be bottlenecking but it will be ok with me