SOLAS CONCORD IMPELLER 13/20 - 20-8026Smaller pitches improve acceleration and reduce top speed Increasing pitch will decrease acceleration and increase top speed Higher pitch than stock can be used for watercraft with more horsepower than stock Limited and Modified impeller recommendations can be used in either application depending on desired rpm and speed Lower pitch than stock can be used for watercraft with re flashed ECU that increases rev limiter for more rpm than stock when