Sid "Scroll" Mayeux has over 25 years of experience in aviation training, safety, and risk management in the military, civilian, airline, and general aviation sectors. He currently trains Boeing 777 pilots, and he built and is flying a Van's RV-7A.
If you always wanted a custom exhaust for your homebuilt but were too afraid to ask, consider this alternative where you build the model and then send it in to the shop for professional fabrication. Author Bret Davenport found the Aircraft Exhaust four-into-one collector system for his Pitts S-1S more than satisfactory.