Interested for Suzuki Swift, just need to clarify a few things..

1) is the package upgradeable to change to the shark fin antenna tuner ?
2)what is the estimated cost for installation at your authorized installer ?
3)what is the GPS software used, and what map format does it support ?\
4) I noticed from the pics that the GPS antenna you provided is the thin wire type. Are they re-useable ? Since I may need to change my windshield tint later on.