Rush 2:1 Full Exhaust System for 2007-2008 Harley Davidson FLH/FLT models - 2.50" Dyno tested - significant increases in low and mid range torque and adding to top end horsepower Available with show-quality chrome or ceramic black coating Ceramic coating inside and outside the exhaust pipe Double ceramic coating improves exhaust gas flow by keeping the pipe cooler. Lower pipe temperatures are more comfortable for the rider and passenger Heavy-duty, 16 gauge steel which has 30% more steel than 18 gauge used by other manufacturers. Thicker steel means longer life and better sound