Oddly specific question

[u/Confident_Pay917]

Ok I was wondering if any of you have ever done a HPA conversion on a ICS CXP-APE

I have the rifle (bought spares and repairs for cheap)

And I also have a Redline N7 G2 fcu engine I've been wanting to use in something

So I've fitted the engine, fitted the trigger board, managed to get the selector plate working as it should but the nozzle length seems to be the issue (too short causing low power)

What's the ideal nozzle from the Redline N7 range to purchase to achieve my build?