Pioneer TS-A1601C

Great. Massive improvement in sound quality, especially the tweeters

Used these for an upgrade in my campervan (Fiat Ducato/Peugeot Boxer/Citroen Relay) and they're very easy to fit. The tweeter clips into the a-pillar trim,and the main woofer comes with a universal adapter ring that fits the door. You have to make sure to use the included low pass filter wiring on the tweeter though, don't just fit the existing van wiring as the tweeter will get overwhelmed with all frequencies. Rather than try and run the wiring up the a-pillar from woofer to tweeter, I cut the parallel wiring at the woofer and just added the filter inline between the van wiring and the new tweeter. They sound great, much more clarity than the originals, and a more powerful bass from a much bigger magnet.