no probs Allan....you'd have to check compatability with the 3GS...i think it is compatible...although ackowledge that the 3GS has a variable charging voltage (or sumat like that)
It worked with my concert 2 which is none Bose, i think you have to specify which so that they send you the correct Denison...... the glovebox is simple to remove, just follow the dash around and undo every screw you see, dont forget to open it and undo the 3/4 on the inside lip...... the probelm with the dension is that it doesnt show track names on the HU...merely just track number upto 100 only..... and you cant identify your playlists, you can only scroll through them all via the left/right CD keys...your effectively blind
if your going to use the Denison via ya Ipod (using the ipod controls) then its ideal as long as your comforable using the ipod whilst driving (not easy)
for a hidden ipod install i got fed up with the crap concert 2 functions/display and so replaced with the above combination... which also gave me a bluetooth phone kit and various other connections for other mp3 players built in...much better if you want a stealth install
Took me about 20 mins max to fit the Denison, the parrot requires an hour as you have to find the ignition feed and mute and wirte it up.... along with adapting two phono leads to terminal blocks
think ive answered everything, if not ask away