Skunk2 MegaPower R Exhaust (70mm) 07 11 Civic Si Sedan JHPUSA Skunk2 Megapower Exhaust System NAPA Auto Parts Skunk2 Mega Power Double Barrel Exhaust 17 20 Civic Si JHPUSA Skunk2 MegaPower Exhaust (Dual) 00 07 S2000 JHPUSA. Skunk2's MegaPower Exhaust Silencers are engineered as free flowing mini mufflers. Each silencer is manufactured from perforated, stainless steel tubing that's wrapped in stainless steel wool and mesh for significant noise reduction and minimal restriction. MegaPower Exhaust Silencers are compatible with all Skunk2 MegaPower Exhaust systems, including 60mm, 70mm, and 76mm versions.