TOPIC:

Hi I’m thinking about getting a miniDSP. My set up is this.
Tundra 2018 factory head unit, non/ JBL
(2) sets of JL C2165 components
(2) 10W1
(1) JL RD900/5
I don’t plan on going active any time soon so still using the passive crossover, how much benefit would l get out of getting a DSP?

You'd still get a good benefit from adding a DSP, time alignment alone would make it worthwhile. Since you're not running active a C-DSP 6x8 should be all you'll need.