Down Nozzles for a Pro Mod

When do you need to add down nozzles in the heads and how much power do they add?

 

down nozzels

I tried it and it didn't work out real well. Besides alot of money for the rails jumpers etc. Just put dribblers in the intake ports. If you want. Don

 

i have this on my car and sean at davenport found a definate power increase on the dyno, carl spiering also had this system and found power but its important to use special atomising nozzels which sean makes
we have a simple system pm for details

 

the down nozzel delievers the fuel in a different state to the cylinder
different tune is required.