98 Octane

This is the first log of the power issues with the x3 m40i (b58 gen 1)

Very odd torque and power issues. E40 of this tune doesn’t have a huge effect as it use to and 98 seems to be pretty lack luster as if it had a boost leak but doesn’t look like it but does have timing corrections which it never use to. Blocked catalytic converter after downpipe maybe??