TBI ECU re map gains 20 hp over 300 XCW and 16 over 300 SX/XC. No new cylinder head needed. $249.95

Absolutely the best ECU remapping avail for the 2023 - 24 TBI bikes. No more boggy bottom end and flat top end. The fueling, ignition timing and exhaust valve opening times are all optimized.
It's all you need. Needing a new cylinder head to make them run is a bunch of crap.
And since it's the only service on the market with a 30 day satisfaction guarantee, we must be pretty confident in the claims.