Does anyone know if a 10" pioneer shallow mount sub will fit in same place of the stock sub? Also does anyone know how it would sound?

 

It is definitely possible with some work. I put a 10" Kicker Comp VR --which is quite a bit deeper -- where the factory Bose was but it required a lot of modification. I believe the stock sub is 8". I had to take out the sub cover and high mount brake light because the sub sits a lot higher than factory. I used MDF board to mount the sub & dynamat to reduce rattling. It sounds great and its plenty of bass for my needs.

Here's all the aftermarket sub info you'll need:
https://acurazine.com/forums/audio-video-electronics-navigation-22/finally-replaced-stock-sub-kicker-rmb8-long-203429/

 

possible? sure
worth it? no

 

that depends on what you're looking for and what your needs are. I thought it was well worth it since the stock sub isn't powerful enough for my taste and I wanted to save space in the trunk.

IMO, replacing stock sub & mounting in the same place is a great idea if you're willing to put in a bit of work.