MF-RS308 MAXIMUM PERFORMANCE WHICH INCREASES UP TO 10 HORSEPOWER HI-POWER & N1 STYLE HIGH FLOW DUAL STRAIGHT MUFFLER W/ SLANT TIP MADE OF HIGH QUALITY T-304 STAINLESS STEEL ( LIGHT WEIGHT DESIGN ) OUTLET TIP : 3.5" , INLET TIP : 2.5" ( IN DIAMETER ) COME WITH REMOVABLE SILENCERS *UNIVERSAL MUFFLER THAT FITS MOSTLY ANY IMPORT & DOMESTIC CARS