Swapping the 4" definitely helped , but on the B&O system, I found the biggest gain when replacing the 6.5's.
Here is a sample, fade left: factory 6.5, fade right: Focal PC165. ( All other 4's are Focal PC100 except for the center, in this video)
I have since moved the PC100 from the rear and used 1 for the center channel and added Focal ICU 100 in the rear for better fitment.
Factory B&O
Focal PC100 front dash corners, factory everywhere else.
Focal PC100 dash corners and rear
Here is a sample, fade left: factory 6.5, fade right: Focal PC165. ( All other 4's are Focal PC100 except for the center, in this video)
I have since moved the PC100 from the rear and used 1 for the center channel and added Focal ICU 100 in the rear for better fitment.
Factory B&O
Focal PC100 front dash corners, factory everywhere else.
Focal PC100 dash corners and rear
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