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DavidXJ
No other changes. Car is bog standard. I was tempted to remap with Evolve but have paid for extended warranty so not touching the engine.
Car is a 2017 X6.
Sound? It's loud. Especially on a cold start. Settles down after a few seconds. In Comfort it's relatively quiet but you can hear it. In Sport, it's mental.
There is definitely drone. But I don't do that much motorway mileage so it hasn't bothered me much. That's with a wife and two kids (12 & 8).
So I would recommend retaining the resonators to start with. The x-pipe will also help of you decide to go with the back-box delete mod.
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