Orion 275XTR tweak

Hi guys, I recently bought an orion 275XTR that I would like to dedicate to my subwoofer, before mounting it in the car as always, I opened it and tested it on the bench.
The amp works perfectly, I decided to change all the electrolytics to give it a refresh and since I have a burson V5 classic I was thinking of replacing it with a signal opa.
In the preamp section there are 3 of them (2xjrc4568 and 1x5532), I also noticed in other amplifiers, that even adding only 1 burson (instead of the main opa) the performance improves, certainly lower than the original opa.
Has anyone already made these changes on this orion?
 
can anyone give me advice?
 

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