Car audio set up question for a beginner

[sixseries]

I just bought an older car (1982 BMW 528e) and I was looking to upgrade the car audio system. It currently has an aftermarket 2011 era Sony stereo in it. The car can only run 4x6 speakers and to run larger speakers, I would need to do some metal cutting which I do not want to do. My plan is to replace the stereo with the Sony MEX-XB120BT which has a built-in class D amp outputting 45W RMS x4, which is sufficient for my goals of just getting good sound out of four 4x6 speakers. I do not plan to have any sub and would prefer not adding the complexity, wiring, and cost of a standalone amp. The speakers I was considering (all around) were either the Infinity REF-6432cfx 4x6 or the Polk db461p 4x6. The Inifinity is rated at 45w RMS and the Polk at 50w RMS. Is there anything I'm missing, or any critiques or suggestions I should be considering?

[blockrocker]

It seems to me that you have figured out what you want and I don't see any red flags about the upgrades you are trying to make. Pick the speakers that sound the best and enjoy the new ride. Good luck!

[Cathul]

The car can only run 4x6 speakers and to run larger speakers, I would need to do some metal cutting which I do not want to do.

That or you build some door boards where you mount the speakers into. As an example German company Jehnert made premade door boards for cars of this era back in the days with up to four 6 1/2" speakers each side.

[SQ_Blaze]

Forget what the speakers are rated at. That is of no concern. What is of concern is their efficiency. The higher that number, the louder and cleaner they will be able to play with the limited wattage of the head unit before running that head unit into clipping.