MagnaFlow Exhaust Products 15139 MF Series Performance Cat-Back Exhaust System 2.5 in. Incl. Resonator/MidPipe/5x8x14 in. Muffler/4 in. Round Tips Single Straight Pass. Side Rear Exit Stainless MF Series Performance Cat-Back Exhaust System 100% Stainless Steel, Axle-Back Stainless Steel; 2.5 in Tubing; 4 in Tip; Single Passenter Rear Exit Lifetime Warranty Dyno Tested And Proven To Make Power Great Sound, Has A Smooth, Deep Tone.