What will add a deeper sound to my cab such as during a breakdown or while palm muting?

Active pick-ups?

and what can give me more sustain?
[besides a new guitar that is?]

I have a 5150 cab which speakers are soon going to be replaced with vintage 30s

think that will help at all?
dude your other thread was closed because this question belongs in the "Guitar Forum", not the Pit.

delete this thread and post in the appropriate forum.