Yes, Flowing the heads, 10.5 to one pistons, modified camshaft, dual electronic ignition, new scimiter blade MT prop as opposed to eliptical blades. Speeds upped from 185 true to min of 191 min to 202 max knots true airspeed. Speeds may be higher as GPS was 4-5 knots faster than Air speed indicator true airspeed. More testing is needed to confirm. Fuel burn at full power is more. Fuel burn at same old airspeeds is less. Take your choice. Bob Smiley N94RJ