I want to get some opinions on my options. I will be building up my EF for a local racing series, and the rules say I have to use a stock-type flywheel, but I can do whatever I want with it. The engine will only have bolt-on mods. There is a company selling lightweight steel flywheels on eBay that are around 10 pounds, but otherwise I’d have to modify a stock flywheel. Should I get one of the new flywheels that are built lightweight, or would I be better off having my stock one machined down?