The Billy Boat Performance Exhaust PRT after-cat system employs exhaust technology that is unique to the aftermarket since it doesn't use a muffler. The Billy Boat Performance Exhaust PRT system is simple in design, though more complex in theory, suggesting that you can have a mellow sound at cruising speeds and a sport note when tearing up the streets. It allows true straight-through exhaust passage under aggressive driving conditions, though a mellow sound is emitted at cruising speeds thanks to the unique Purge Chamber. This Billy Boat Performance Exhaust PRT system works purely on physics without mechanical devices to direct exhaust flow.
Using an in-house Dynojet chassis dyno on a 2001 6-speed with a Billy Boat Performance Exhaust PRT system show gains of 12 additional horsepower and 14 lbs/ft of torque. BB Part Number FCOR-0235.