I went a similar route, I kept the Bose HU and AMP, just changed all the 6 speakers except the sub. I wanted to keep the HU for the time being and focus on other items. Took a chance and it worked out well for me.
Used low ohm speakers throughout, this system sounds pretty darn good. I now have what I would call a pretty decent system (YMWV). Does it rattle my nads, no, but it's enough with the Bose sub.
Tweets: Infinity Kappa 3/4" Soft Dome Tweeters-Pair (Black)
Did not use the included crossover, the Bose amp "takes care" of it.
Had to get creative on the install, created a mounting plate based on speaker mounting holes.
Doors: Infinity Kappa 62.11I 150W 6.5-Inch 2-Way Kappa Series Coaxial Speakers
Used the Zenclosure spacers: Nissan & Infiniti Speaker 5.25" Spacers
JBL GX302 150W 3.5" 2-Way GX Series Coaxial Car Loudspeakers
Had to get real creative on the install with these, not sure if the sound improved. The service manual says the amp provides full range to these speakers...
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2016 Sport 6sp Deep Blue Pearl || AAM intake || FI TDX non-res CF + HF-Cats || TEIN MonoSport w/EFDC-II || Hotchkis sways || Z1 34 row oil + ps cooler + diff cover + oil pan spacer || TWM Short Shifter || SPL everything || MA-MS diff cooler || Stillen brake duct || ++
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