tony597fitter
Tax Payer
My brother did 521 on a set of Bosch marine 300's (40-50 horse) untouched and they are like 60$ bucks apiece. I would say $360 fits the budget.
You might as well stay with a set of stock 215s.
Marine 300s are dirty and the wrong spray pattern. They are 4x.012"
Stock 215s are the correct pattern will take you to 500+ and they are 5x.010".