This kit will work just fine on your application. If the car is stock otherwise, this will come with everything needed to install. We still recommend having the car dyno tuned to ensure everything is running within safe parameters.
The hp numbers they list are based off factory. If you do exhaust modifications like that, it will definitely compliment the blower and yield greater gains. Those mods would require a dyno tune at that point. Other popular modifications with this blower are an upper and lower intake manifold, and larger throttle body to free up additional flow.