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The JB4 still has no safety for high rpm misfire detection and single cylinder fuel shutoff. If the DME cuts fuel to one cylinder after a misfire event the PI will keep spraying alone and cause a hyperlean condition in the cylinder which is very risky especially if the DME doesn't cut spark (the assumption is it does but we don't know for sure yet). Not worth the dice roll imo.
I tune these cars so I'll be doing it myself (currently FBO with stock turbos on a custom tune). Just pointing out that you definitely want a custom tune when you've got larger turbos to make sure it's all safe and dialled in.
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