Here's a time-proven 2.25" exhaust made with mandrel bent T-304 stainless steel tubing mated with a stainless steel Borla muffler and 12" Techtonics resonator. Typical gains are 7-8hp. Fits '85-'92 Mk2 Golf with 45mm catalytic converter outlet pipe. Builders of '90-'92 cars must verify cat exit diameter. Clamps and rubber hangers are included.