^Which is true but I also think a higher impedence is also more efficient? So although more power is needed from the amp its using it more efficiently? Idk, but I never blow my ears out when driving any more anyway lol so I'm not too personally worried about going to 4ohm all around -

The Peerless 2" midrange should basically drop in with minimal if any modification from my preliminary research but I will confirm next week with pictures.

Even at $300 for 2 of the C2-600 sets, $35 for Memphis Midranges, and $65 for Peerless rear door midranges, you're at $400 invested and have an extra set of tweeters you can sell for $50 probably. So not bad at all!

Or you can do Memphis x2($35), Dayton Woofers x4($160), and a set of JL tweeters ($75) so about a $100-150 difference. I looked on PartsExpress and didn't find anything I really loved on tweeters (although I don't know the exact size of the OE driver), but I'm sure there is something that would work - If I went with 4 Dayton woofers I would go with Dayton tweeters (I like to keep my brands similar as much as possible)

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards