Last night I installed the SubTube BTA6100 in the trunk of my 2014 w/ a Shaker System.
The feed was from the rear deck speakers. Sounded MEH... could barly hear the thing (with the gain full up). This morning I called SAS Audio, and the tech called me right back and informed me that the 4 5x7's are filtered from the low frequencies. I needed to tap into the subwoofer feeds. I called the audio shop where they installed the rears, they had me bring it by and ran 2 leads from the subwoofer side of the amp to the trunk to tie in to the BTA6100.
NOW this works just the way I wanted it too (with the sub tube gain at 1/2 -2/3 up). Bass +2/3 on the headunit at quiet volumes will provide the little kick that was missing, turn the volume up and it provides more bass than the door subs.
So, now I replaced all 4 5x7's with infinity 6832 and added a Bazooka BTA6100 for additional, tighter bass. All in all, these were fairly inexpensive yet very noticeable mods.
2014 - V6 Premium w/ Pony Pkg ~ Boss 302 Strut Brace ~ Infinity 6832's speakers ~ Bazooka BTA6100 Sub Tube ~ Matte Black Stripes ~ FRPP 18x8.5 Matte Black Bullit Wheels ~ Air Raid CAI ~ MBRP S7242304 Exhaust