So i just got an 07 a6 3.2 and was wondering if the OEM rs4 wheels would fit. This wheels are 19" and have an offset of 52. My current wheels are only 16" with an offset of 45. Would I need spacers of would they fit directly on. Thanks a lot in advance.

if the bolt pattern is the same they will fit ... they might look a little funky with the offset

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2008 Tahoe LTZ blk on blk
Parrot handsfree bluetooth / GM Lockpick NAV hack module / xenon headlights / smoked tail lights / 20% tint all around / painted black badges / HID fogs

1800watt MTX amp
12'' MTX Sledgehammer Sub
Used to have:
2002 a6 2.7t s-line / GIAC / REMUS / AWE-Tuning s-flo intake / Forge splitter DVs / vast stage 3 tip chip /vast piggies / obx manifolds / samco tbb / 19''x8'' MMR wheels

It would fit but you should try buying 32 or 45 offset.

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2006 Audi A6 3.2 (Blue and Amaretto)
Tech and Premium Package
RS4 replica wheels
2005 Infiniti G35 coupe

I'm considering the same but was wondering how much this project might cost? My concerns are complications from having to reset odometer / speedometer due to different diameter wheels, integrating the tire pressure monitoring into the new wheels, and wondering if there is anything that needs to be modified on the quattro for the larger wheels?I suppose you'd have to buy 5 wheels too, since the OEM spare would be wrong size.

Yes, you will need 5 wheels, tire size should not matter for the upgrade so long as you stay within the same general overall range. The biggest issue will be the TPS and getting the monitors switched, IIRC, I have heard there is a way to turn off the system with Vag-Com, don't know if the dealer will do it, but an Indy might. As far as fitament, take off one of your wheels and try fitting the other wheels to see how they are for clearance.

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'01 A6, 2.7T Tip, Melange with factory 4 tone interior (very rare color combination) APR Snub, ASA ST4 summers, window spoiler, M style trunk lip spoiler, smoked Euro tails, Euro plate surround, fog light rewire