Well I just got my Clockworks Werks B5 yesterday and ran 2 tanks through it using OD 30%..HOLY COW, this is one helluvan engine so far. I'm currently running the JP3 pipe while I wait for my 2013 to arrive and I just love it so far. Will be running the Clockwork fuel today so I'm guessing it will be better yet..can't wait to get her race tuned!