Iv'e just changed the 2.5 in my 96 swb shogun as the old one had water problems.The replacement engine is older than original but I still expected it to go ok.Problem is it doesn't rev under load ie put your foot down and not much happens :'(,certainly not what you'd call acceleration).Turbo is good and belt timing is correct.It doesn't smoke and sounds fine mechanicaly.any thoughts please.........thanks.