Reversing the rims will increase your wheel track that gives you extra stability but can foul guards (I have been told I havnt got them) but will not change your wheel alignment or caster only the longtatudinal load on the wheel bearings but they should stand up to it no worries.
I assume you meant a 2" lift not 2' as a 2' lift would require a few mods of the major kind.
My disco has a 2" lift and the steering actually feels more precice and the only thing negative is a vibration that has developed since I put it in.
Nothing that cant be lived with though.
As far as blocking off the EGR goes, EGR doesnt effect performance if it is working effectively and you will lose economy for very little gain if any by blocking it off.
I dont know much about the rover system but they all work in a similar way and they only put exaust gasses into the engine on decelleration or light load so it shouldnt have any change in noticable HP.


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