you will not see an difference, performance wise. the temps and pressures stay about the same but you wont have all that sut caking in through your coolers, EGR and intake manifold.
im sure all the people that have had their intake manifold off can say how much of a PAIN it is too clean, even through a parts washer. the EGR delete on its own cost about 300 or so, if im not mistaken. some of the vendors on here give pretty good package deals and the majority of the work can be done in your driveway with simple tools (aside from the headstuds).
i do recommend studs and at least EGR delete. small price to pay now for something that can happen worse later