Megaphones with 2.5” ID and fixed diameter fixed cores are great for a very minimalist look such as bobbers or naked bikes. Instead of running a bare header try one of these megas to give a finished look and better sound to your bike.
Brush Finish 304 Stainless Steel. Cone/Reverse Cone, slips over inlet dimension shown. Overall length 12". Universal fitment. Fixed internal mild steel perforated core with SS wool wrap. Bracket fabrication recommended in addition to use of retainer springs, mounting tabs, or clamps - which are all sold seperately. May not be legal for street use.
4.00" max OD then tapers to 2.5" outlet OD x 2.50 ID ( header side ) x 12.0"Length