Where’s the fun in that? Just buy as much as you can afford for amplifiers to drive all the new speakers hard. Hook everything up and see how it goes. If Bronco has issues when the big bass hits, throw a capacitor in line. What could possibly go wrong?
Oh, and I can tell you that my Bronco has no problem with my little system using a Fosgate P400x4 and an Audio Control ACM 1.300. No capacitor. No issues after 2 1/2 years.