Using your Invidia Gemini cat back exhaust is easy. First, make sure your Nissan 370Z is parked on a flat and stable surface. Then, carefully install the exhaust system using the new hardware, gaskets, and clamps that come with it. Ensure all parts are tightly secured for a proper fit. When it comes to maintenance, regularly check the clamps and connections to make sure they're not loose. You can also clean the stainless steel tips with a mild stainless - steel cleaner to keep them looking shiny. As for the sound, remember that if you have headers installed, the exhaust will be louder. So, be mindful of your surroundings, especially if you have neighbors close by.