Yeah, I think a lot of people do. There are a ton of pre-determined values for port size and timing for many engines but engine modders (the "pros") won't share them. If you degree the engine to determine the duration, port size/shape, timing of the ports, and the compression ratio and take all of these values into account, anybody can peak a given engine to max power. It's very time consuming and requires a lot of testing. Having a number of good pipes is necessary as well. The exhaust system has a huge influence on performance.