Mercury outboard 300 ProXS

The best 300 HP on the market for anything performance related is the 300R from Mercury Racing; by a long shot. The second is the 300 ProXS, for those that need a Torque Master gearcase and don’t the need the extras the R offers but are still capable of running up to around 85 MPH. What makes the 300R so incredible is the fact that it has just the right options for almost any user. There are different mid sections, the regular tri-ram with solid lower mounts and the HD midsection for more serious offshore use, with a forged bracket, single ram trim and external trim pump. With the HD, you can get a Mercury Racing wing plate for tie bars or a side mounted steering ram as well. 

One of the biggest differentiators in outboards is the gearcase and this is where Mercury kills the competition in every model. The 300R, specifically, has 3 available gearcases, the Sport Master with two gear ratio options (1.75:1,and 1.60:1), the Torque Master and even the massive 5.44” for big heavy boats running the gearcase deeper in the water. Consider that the 300R is available in L-20”, Xl-25” and XXL-30” and truly you can spec a 300R for almost any boat with any configuration. 

The 300R has a competitive starting price, although the HD versions can get up there, you simply have no other options on the market that combine these features. Furthermore, the tuning Mercury Racing has done to the 4.6L V8, like performance cam shafts and a performance intake manifold, means it can rev up to 6,400 RPM and makes far more power than other 300 outboards. 

Mercury’s ProXS line is geared toward the bass and performance fishing market in general and are great repower engines. Priced right, with a little performance touch; RPM increase, upgraded gearcases and are a little lighter than the non Pro engines due to a lighter cowl. For the 300 ProXS, the formula is the same, 6,200 RPM, Torque Master and it is the lightest 300 on the market. If you’re boat runs under 85 MPH, this is the best bang for your buck. The regular Four Stroke 300 is available with the 5.44” case and a variety of colors and is great for big heavy boats, as is the Verado with “AMS” (advance midsection) and integrated steering.