Get maximum flexibility from your modular SLP cat-back system with our new "Loud Mouth II" bullet race muffler. It offers flow and performance similar to that of our original Loud Mouth? resonator but features a ceramic-wrapped, perforated core that reduces high-frequency noise and in-car resonance. Each Loud Mouth II muffler is constructed from hand-polished 304 stainless steel and embossed with the classic SLP logo. NOTE: May also be used in the fabrication of custom exhaust systems (see measurements below). Does not fit 2.5" Mustang or GTO systems. Measurements: 3" ID/OD 4" body diameter 18-1/4" overall length