Whoa old OP date...
One of the things I wanted to do when I got my car was to get the interior up to my B6 standards (which had an RNS-E). Little by little I did a few mellow mods that really transformed the feeling of the interior, while keeping it very OEM, clean and simple. I really think the departure from the wood trim, symphony radio with tape deck and the steering wheel make a big impact.
Here are my mods:
• S3 shift knob / boot conversion
• Defi boost gauge and power commander
• S3 Euro flat bottom steering wheel with airbag
• Hardwired V1 radar detector
• OEM RS4 Door Sills
• OEM RS4 Black Door Handles
• RNS-E Audi Navigation
• Bluetooth
• OEM RS4 Piano Black Belt Line Trim
If I decide to keep this car, I think I'd end up doing the Recaro Sportster CS seats that I've coveted forever, redo the silver alcantara on the side panels to the newer style black nappa leather with the rear seats to match, and maybe an RS4 cluster.
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