The price will go up for us canadiens. On my Stinger 2020 I paid aroud 600$ cad with + 20 HP and 24 more torque without adding JB4.Yes. They gained a fee hp but nothing crazy.
Limited by ecu probably. A piggyback tuner is jb4, Lap3 and alike. Sxth has their own as well. A tune will take advantage of the extra air flow.