Hey This is Sircnay's friend. I have been tuning Honda ECU's for awhile, basically rechipping them. Rechip and tuning is simular but different. Rechipping is generally using someone elses maps perhaps with the same set up (most just buy junk "eBay" chips, or there are chips that are fully programmable to do whatever you want. I have equipment to chip honda ecu's, Me and Chris did research and realized the internal workings of a Nissan ECU are the same as a honda, i have since gotten the software to tune Nissan Ecu's. Custom features include speed limit removal, Custom redline, custom fuel map and igniton map. Exact duplicate of what "Full Standalone" has to offer, all they do is adjust those parameters, which is basically controlling how your motor runs.
However on a Nissan, a daughterboard is required to supplement an external rom (data) However with daughterboards for Nissan's, there are 2 roms, you can switch it from aftermarket back to your stock one with just a switch, just for safe measure if u ever wanted to run your stock map again.
I can be reached via aim at Streetriceror
[email protected] Thanks