johnnyaaj2003 :
Can I use a different driver and amp with a VIZIO SB3851-D0 subwoofer for better bass?
Can you? Sure.
Will it sound better? Completely unknown.
Generally, the cone, amp, crossover, and box are designed to work together.
Putting in different parts may or may not be 'better'.
Far more beneficial just to buy a new sub that meets your needs.
Or, go full custom and build your own.