bought a newish 2nd hand tinny(quintrex coast runner 4.55) with above engine<br />engine has 72 hrs<br />boat used to pull a "donut" with kids on and a bit of skurffing, occasional offshore runs to surf destinations<br /><br />are there ways of increasing the power out put<br />eg reconfig efi unit, power chips etc?<br />using PULP ?any all above or other<br /><br />i notice specs of 50 similar to 40 ie egine size etc, some said just differet states of tune, is this correct? if so is this a dealer issue?<br />any comments appreciated