Chris Davey wrote on Friday, March 09, 2007 - 09:59 am:question: does the amount of boost required actually matter that much? e.g. say both of the above cars were making 280rwkw and one used 18psi and the other 21psi. Which is harder on the engine? They must both be ingesting the same amount of air and burning it with the same amount of fuel to make the same power but would the less efficient 21psi GT30 be harder on engine internals? I don't think it would be but could someone comment on that?