2018-PRESENT M8 Softail ST & Sport Glide - Big Bore 4.5 Color:Stainless 18mm o2 bungs with 12mm

18mm o2 bungs with 12mm adapters

if you have a Softail Big Bore

Tuned properly can accommodate 88" to 143"

If you have an Elsinore system you MUST order Elsinore Pro Flo Headers etc

For st models please include your bike on the cart page for a free bag mounting bracket

2018-PRESENT M8 Softail ST & Sport Glide - Big Bore 4.5 Color:Stainless 18mm o2 bungs with 12mmFits all new 2025 softails & lowrider sts with updated cam cover. We fit *all models 2018 2025 except breakout & fatboy 4. 5 high flow performance rolled cone muffler with stepped baffle from 2 to 2 inches. Increases bottom to mid range torque and horsepower on all motors. Tuned properly can accommodate 88" to 143". 065 stainless steel headers, stepped from 1 to 1 7 8 to 2 at the collector Hand tig welded from top to bottom Machined stainless steel