This stinger exhaust system is a great improvement over traditional exhaust systems. It saves weight while allowing your Porsche motor to produce the horsepower your car was born with! This stinger set up WITH silencer is rated at approximately 100 decibels (3.6 stock motor measured at 40 Yds) depending on engine configuration this number may be different. Stinger systems come with all applicable gaskets, nuts, bolts and washers needed. Stingers are sold as a set only. Ask us about Ceramic Coating Services!