Dumb question, turbo switching

Alrighty. So say you want to replace your factory T2, would the relentless performance turbos or any other turbos for that matter just bolt in place of the old one? I wouldn't think so, so what kind of modifications have to be done? I know this is a rough question, but I just want basic answers. Thanks.

[89daytonaTII]

as long as it still has the chrysler flange to bolt up to the exhaust manifold it will work. modifications are needed if running a t4 compressor side in order for the wastegate to mount somewhere.