Audi S5 2008-2009, Proton Series Nitrous System by Nitrous Express®. Proton systems now contain a new and improved nitrous / fuel module that is capable of producing up to 250 horsepower to the wheels! The new nitrous / fuel module is extremely durable and is compatible with progressive nitrous controllers.
- Single Shark Nozzle
- 35, 50, 75, 100, 125, 150 WHP
- 10 lb. Bottle w/Lightning 45 Bottle Valve