In my last car (BMW 330D M Sport) I fitted a JL 12W6V2 sub, powered by a JL 500/1 mono block amp. I bought the car when it was 1 year old and fitted it as I was not desperately impressed with the BMW system and quite like bass heavy(ish) music. I was impressed with the upgrade and enjoyed fitting it too.

I now have a B8 S4 on order, which is due to arrive on Sep 1st :-)
(Budget was already getting stretched and wasnt able to get B&O, but....)

Any thoughts on the standard stereo versus the BMW one? (Somehow didnt feel right cranking up the stereo at the dealers!)

Has anyone retro fitted a sub to a B8 S4 / A4? Any tips?
(In the BMW I fitted it under the floor (where a spare tyre would go, but as the car had run flats, lost no boot space at all with the install)