The latest in our line-up of Full Merged Exhaust Systems. The New 1 3/8" Full Merged Exhaust System was designed for smaller engines running smaller valves and smaller exhaust ports. This is the same Exhaust System run on the CB/Hot VW's Project Mileage Motor that produced 92hp on JayCee Ent. Dyno. You can see the Hot VW's Project Mileage Motor Build Story in our Featured Articles section.