Breaking up at higher boost

[Sweet6]

You may need to clean up the waste gate hole on the turbo

 

[Razor]

misfiring is typically plugs or coil pack=ignition related.
detonation is running too high a boost level for the given octane. If your scan master reads in the low 800's , shows no knock.. and it cuts out.. its ignition related.
Put some new plugs in gapped at .032 like the TR5's, AC 43's, etc.. and check your wires for rot or corrosion. Past that its coil pack/ignition module.
But its easier to start on the 12 dollar parts and go from there

 

[TurboBuRick]

In my experience, external gates require port work on the exhaust housing. Otherwise you will over boost or get creep.

Rick