Advice with tuning up old school car Sony Amplifier signal path.

I have a XM-460GTX 4 channel car audio mosfet output amp that I found on ebay and would like advice on the input stage for the high drive input... it currently has .22uf input caps with the rest of the signal path showing 4.7uf or bigger. I am wondering if I can bypass these or use a higher value?

Also -- suggestions for IC upgrades?

See the preamp schematic attached.

Thanks,

MFA
 

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