I had 176hp@6720/ 203Nm@5800 with regrind cams, slightly ported head (only intake side), 10,8cr (wiseco pistons) and ebay chip.
Ebay chip and stock injectors caused "some" pinging and corroded head. :/
In my setup stock AFM restricts badly top end power.
Now putting m40b18 rods and pistons in for a turbo

