This is why you/we need to see some data.
545tq@5200 = 539hp at that rpm
It appears the 487hp number isn’t the “peak”.
On an engine dyno, torque is measured.
Hp is calculated.
In order to have 487hp@5300rpm, the tq number at that rpm would be 482.
It’s highly unlikely the engine TQ numbers dropped from 545@5200………down to 482@5300.
