J2 Engineering J2CBEDS039 Dual 2.75" Tip Catback Exhaust System for VW Jetta Mk3 TIG Welded CNC Machine Flange for Resistance Against Pressure and Corrosion Aggressive Deep and Smooth Tone Sound while Ensures Smooth Exhaust Gas Flow Dyno Proven to Instantly Increase 15 to 25 Horsepower or Low End Torque 2.75" Dual Muffler Rolled Tip / 2" OD Inlet / 2.25" OD Main Piping Diameter Application: 93-99 Volkswagen Jetta (Instruction Not Included. Professional Installer is Highly Recommended)