Keep the 422 firmware. Just tone it down for mod. As this firmware was made for stock. Now you have the options for turbo delay timing and turbo boost. Similar to the tekin. The DRRS setting I usually keep it at 8 or 9 depending on your gearing. But now you can fiddle with option 13 and 15 as this will give you more punch. So you don't really have to worry about the DRRS.