Hello,need advises about cm870

[Magnat1976]

Hello everyone, i am thinking to buy,2005 volvo with cm870 with 400hp.10 speed meritor,3.58 rears..and would like your opinions,especially Rawze,about this engine..I am going to look at this truck on Wednesday
400hp can be increased?or its enough for Midwest runs,no hills,no heavy loads.if Egr is working, keep it or delete?and if delete,how to do it properly?