I believe when you get a handle on your tune up you will get some more out of it.A man that races with us picked up a 1/2 tenth in the 1/8 mile,using a single flying toilet on a 582 cu in chevy engine switching from M1-M5 no other changes.He got some tuning tips from a man in Texas who was running the same engine combination.So he was close on his tune up at the start.