19-25% Impact for 1.5s on Hit. Stacks 5 times.
14-20% Impact for 2 seconds on Repeated Hit. Stacks 5 times.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
14-20% chance Elite and Special enemies Explode on kill.
Fun fact, you can use the knives to animation cancel the pull out for the flamer. Effectively making the transition miniscule.