I took mine out today after searching for awhile for the exact info but no luck. Here is the info on stock sub on a non nav, non nakamichi 2006 GS300

10 inch
dual 2.5 ohms

will post pictures if there is any request. email me at thaiquach@yahoo.com
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info for removing the stock sub:
- remove the bottom part of back seat first by lift the front of the seat. There are 2 snap-in clips. Just pull up and slide it out to the front afterward.
- remove the 2 bolts behind the rear headrests (pull up the headrests), remove 4 bolts at bottoms of back support
- remove the top piece that covers the subwoofer, there is one white snap-in clip in the middle at front (pull up), 2 while plastic hook on two far side by the rear quarter panel (press down) and slide it out to the front.
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Sweet - This is just what I needed - I'm going to see if I can install a shallow 10 inch subwoofer along with a Kenwood Excelon Class-D amp today.

Trunk space is already an issue for me, so I figure I remove the stock sub and throw in something a bit subtle...

 

4080 sells a really nice sub enclosure for the GS, fits perfectly on the left side of the trunk perfect alrenative

 

I think i remember seeing something from them- it goes on the left end of the trunk? I think what repelled me was the price - $300+!?!

 

just finished installing a Kicker 10C104 Free air sub. It kicks pretty well for a 10-inch! On some rap/hip hop tracks though, there is a slight rattle coming from the shelf. I will need to install some dynamat beck there or something...

I originally installed a Rockford fosgate P3SD410 shallow mount sub, but since it required an enclosure, it was more rattles than sound. It moved too much air for install over the stock location.

 

Did you install it in the factory subwoofer’s space or in a box? Also was it with the factory pioneer amp?