Best way to verify here is a wideband!
I agree, I think its time to pull the cat delete pipe and weld in a bung for a wideband. Maybe remove the spacer on the second O2 and delete it in programing then install it there. Maybe to far away from the turbo? Ill have to see what the recommend distance for the LM2 is.
Is 300hp really reachable with the k04?
I know 300 is asking a lot from a K04 but we can all dream like I said 250-300 would be the goal.
Not easily but I think it's been done with WMI, different exhaust manifold, injectors, etc.
~270/280 is the max really I believe.
Water/Meth would be fun.