Porsche 718 Boxster / Cayman NHP Cat-Back Exhaust with Sound Valves Porsche 718 Boxster / Cayman NHP Cat-Back Exhaust with Sound Valves Description Porsche 718 Boxster / Cayman NHP Cat-Back Exhaust with Sound Valves Need More Sound? More Pops? Look no further. This Cat-Back Exhaust will replace your factory mufflers. This exhaust features our Sound Valves that enables you to quiet down the exhaust with a push of a button. This exhaust features a set of resonators, the exhaust flow goes trough the resonators when the sound valves are closed, the factory exhaust has a set of mufflers the NHP exhaust will be slightly louder than stock when the valves are closed, resonators are less restrictive than the factory mufflers. When you open the sound valves you will hear her scream  as loud as she can , the sound valves enable the exhaust gases to bypass the resonators and give you a bunch of Pops, Burping sounds especially on deceleration!  ​This exhaust installs without and modifications.    Click images to enlarge Pictures sell! Auctiva offers Free Image Hosting and Editing.250+ Listing Templates! Auctiva gets you noticed! The complete eCRATER Selling Solution. Track Page Views WithAuctiva's FREE Counter