mazdab8, browse these threads for your hella flush inspiration -
OFFICIAL AGGRESSIVE OFFSET THREAD - Mazdaspeed Forums
and
6/MS6 Wheel Photo Thread
There's a member on there running 19x9.5 et25 on his MS6. Looks dope. But probably drives like balls on Australian roads...
Here's a quick few photos:
Specs:
Oh yeah, forgot about this one. Here's a more conservative set up that I really LIKE! These wheels are only $260 each from tirerack... hmmm oh so tempting
Specs:
So you can definitely push the limits of the conventional 8-8.5 et30 wheel upgrade as seen above... its just up to you on how much you want to be hassled with pothole dodging and driveway angling. The front of the 6mps bar overhangs a fair bit.
Me personally, I like corners too much. So I'm just going with a simple 18x8.5 et40ish with 245 tyres all round
Snuggled under the guards for extra interweb points