contradiction.
If you want to run it N/A you can as is, but it will have a low CR and disappointing power.
You can swap another head on or shave the P90 down to bump up the CR.
Triples = $$$
If your on a budget just grab a set of used SU's, a spare E88 head and call it good for now.
(even Iv got a few just sitting in the shed)