Edelbrock Performer RPM Single-Stage Nitrous System #70033 is designed for use on carbureted V8'S. The solenoids are larger than our Performer systems helps increases power that can be adjusted from 100-250 horsepower. Edelbrock Nitrous systems are simple to install with a 1/2" thick aluminum plate that fits between the carburetor and the intake manifold. Edelbrock nitrous spray bars are precision machined on an EDM machine instead of standard drilling, giving you the best flow characteristics available. This system is for use with square-bore carburetors and has a polished bottle.