Clarification on non-nav, Bose system, want to keep OEM HU

JustinP

Based on what I'm reading in THIS thread here. it appears that I can keep the OEM HU which is Bose, non-nav, keep the original wiring, remove the Bose Amps, Bose speakers, and be all set...now I know there was some controversy about this thread, in the main thread that is a sticky. (cause I use that search function). But because it is all a few years old I'm wondering time has taught us anything:

#1 Is this doable without damage to the HU, electrical system, new speakers?
#2 I'm looking to install the Wicked Corner Stage 1 kit. Now, I emailed them, and they said the AMP in the kit has an LOC in it already...so I think I should be good?
#3 What am I missing out by NOT upgrading the OEM HU? (Has anyone done this and regretted? I'd prefer first hand opinions over opinion on this...my guess is lots of folks will simply say 'quality' or 'volume' but first hand experience is what I'm after if possible.)
#4 Are there any DIYs / tutorials on what I'm trying to do?

I'm not looking for AMAZING sound. I want something more full, with a bit more punch, and higher quality then OEM. Clearly I'm not willing to sacrifice the OEM look, or the steering controls etc...

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