john i am in the opposite direction.. i have used 3pk with fasst and just got a 4pl.... looks like the fasst system is 3.3milliseconds and the 4pl is around 6.6ms for speed... might have to work a trade with you as i have 2 3pk both with fasst systems and 4 recievers.. trade 1 3pk w/fasst and 2 fasst recievers for your 4pl? send my an email or pm.. i will be at leisure hours on the 30th for the widwest nitro race.. jeremy