I have 2005 baja sst with a 496ho in it only 270hrs and whent on the water for the first time this season and the engine started perfectly but when i give gas the boat and engine sounds and feel like its forcing the only thing i change last year i had to have the waterpump houseing machined ....i have water coming out of exhaust ....so cant be the impeller! Maybe the housing diameter? ....pls someone tell me were to go and start checking tks

Not sure what forcing means?