"DIRT PRO 357 PLUS" "DIRT PRO 357+3" Approved by UDTRA Lucas Oil Late Model Dirt Series WoO Late Model Dirt Series Southern Allstars Late Model Dirt Series Super Late Model, Late Model & Sportsman This muffler will handle the ( FLOW )of a Big Cubic Inch All Aluminum Engine as well as the smaller Steel Head Engine's. The "357 PLUS" has .500 size louvers placed in a Right Hand Rotation Pattern for greater " FLOW " which increases "HORSEPOWER" Dirt Pro Race Mufflers are 100% Aluminized 16 gauge steel, Welded Construction for Durabily & Strength.

Dirt Pro Race Mufflers recommends the use of a hanger at the rear of the muffler. A hanger will greatly reduce the stress applied to the header. "357 PLUS"