Any partial upgrades to the factory system will be a blessing and a curse. If you want my opinion, do the transducers first (all of them as a kit) from BavSound and then do the Amp.
If you do one and not the other, especially if you do the Amp first, you will hear that weakest part of the system. There are no shortcuts. You replace the drivers, you need to add power. You add power, you must replace the drivers to reproduce that fidelity and to give you more sound pressure.
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