We know that any Harley motor is engineered to take only so much strain and pressure of stock config or common and fairly vanilla upgrades. So let's not get all cheap here. You can save some bucks and put a Trask on a stock engine or even one beefed up with a fatter crank, but if you plan on riding regularly, then that near-stock engine just won't make it and the recriminations will spew forth in a river of tears. That Trask or a similar charger will need some solid, uranium enriched, bulletproof motor from S&S or Patrick Racing (if they still exist) or some such that can handle the HP increase, the heat and internal pressures. We all want something for nothing, and we get...nothing. Just my judgment on this.