I had 6 jets when I fished the New River in VA...All the lower jet units are made by OJC in CA..They make the units for all motor manufacturers...Company owned by Dick Stahlman....
If you have a 50hp powerhead you will have approximately 33hp leaving the jet pump. 90hp powerhead will have approximately 63hp. They are not a good choice for lake fishing but are excellent for shallow rivers...They are also gas burners..If you want any more info let me know...