No, cc can be changed without balancing. Just mark everything so that is goes back together EXACTLY the same way. Mark turbine and compressor wheel so they are the same on the axel. Also mark the axel (not needed since turbine wheel stays on it.

You can replace almost everything even the bearings without balancing. Only when you replace rotating parts or have a damaged wheel you need to rebalance.

I run the jetjoe 1400 now at 167k (169k max seen in ecu log) with a max egt of 650 when using long times of full power (2 piece cone). I have not measured the power but the difference with 160k is noticcable.

Total runtime according to ecu now 560 minutes. It has used about 50 liters of fuel now (including testing) and has almost 180 minutes of airtime. Still very happy