Wisconsin v7 Racer
Cruisin' Guzzisti
https://gtmotocycles.com/products/gt-motocycles-v7-v9-ecu-re-flash-tool -- it can't get much easier then this product. Tell him your mods order it and follow the instructions for loading the new map. Or run it with mods and no fueling adjustments and risk wrecking your bike. I had to remove my ecu and send it and even that was easy and I never did anything like it before.