The most advanced PSRU’s available for 150 to 300 HP engines. Potential Engines In-line 4 Engines  In-line 6 Engines V-4 Engines V-6 Engines Small V-8 Engines (up to 300 HP) Advantages 7.0 inch vertical offset design between the input shaft and propeller shaft. PSRU 38-39 lbs Flywheel Assy 32-34 lbs.Total 70-73 lbs, 27-30 lbs less than SD400.Current price $40,000. For anyone seeking details on the 300Z PSRU Gearbox for 15-300 HP Engines, these specs show its uniqueness.   More About Us Location