Skunk2 Mega Power Double Barrel Exhuast Civic Si Coupe 1.5L Teknotik Skunk2 MegaPower RR 12 Honda Civic Si (Coupe) 76mm Exhaust System Skunk2 Racing MegaPower Double Barrel Exhaust Honda Civic Sport Skunk2 Exhaust JHPUSA Skunk2 MegaPower Exhaust 92 00 Civic Coupe Sedan JHPUSA Skunk2 MegaPower RR 17 21 Honda Civic Si Sedan Exhaust System. The 76mm MegaPower Double Barrel (DB) exhaust system features 304 Stainless Steel, CNC Mandrel bent piping and robotically TIG welded joints for the highest strength and exhaust flow. Coupled with a minimally restrictive resonator and parallel, twin straight through race mufflers, this exhaust matches maximum performance with maximum style.