The exhaust is standard except for the tip. The rear muffler has "nissan" stamped on it. The rear muffler also has a factory electric actuator, with factory switch inside. The switch reads :silent /sport. I personally cant hear the difference. You can hear the actuator operate from outside when switched tho. Having said the exhaust is standard, it still makes a decent note under load, but doesn't drone when cruising. As for a dyno sheet Ive never really been interested in power figures etc, as this is my 2nd car/daily driver. After turbo upgrade I had a "sniffer" test to ensure correct air fuel ratio's and to check the engine didn't "lean out" on boost. Car has never been ran on at standard unleaded always premium as these engines were never designed to run on our standard octane unleaded, as Japan's fuels are far better and higher octane.