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The Borla Boomer Thumper muffler is a universal-fit, performance-oriented muffler with a 2.25 inch center inlet and single 4 inch round tip that creates a deep, attention-grabbing exhaust tone. Constructed of T-304 stainless steel with fully welded construction and CFF acoustic packing, these mufflers improve exhaust flow and can add a modest horsepower increase while backed by a Million‑Mile Warranty.
Borla Boomer Muffler Thumper Oval 2-1/4in In 4in Side Round Out
