how to install?

started prying at the one currently on the wheel; had nightmare visions of the airbag going off. any input on how to correctly install this (ridiculously overpriced) replacement piece will be appreciated. thanks in advance.

I believe there are screws on the back of the wheel that hold it on. I don't believe you have to remove air bag but could be weong, either way shouldn't take long.

Have not done it myself however this should be about the same as it relates to airbag and trim (9-10)
http://www.m3post.com/forums/showthread.php?t=242963

Also read this one
DIY: Removing steering wheel trim

You will have to remove the airbag first in order to remove it. Here is the best video I have found to make it easy.

The release holes referenced in the video are covered by the leather, therefore you'll have to use a something sharp in order to make a small hole as possible and then use a small screwdriver to release the airbag.

I just did this to my car yesterday. I did not need to remove the airbag, but it would've been a little easier if I did. You simply need a T20 Torx driver for the three screws that hold the trim from behind the wheel and the two that hold the buttons. If you don't remove the airbag, be prepared to wiggle and have less room to unscrew the buttons. The whole process took me 15-20 minutes.

How much does it cost & can u post the part#?
I need to this soon....thx

Pick the one you need:

http://www.ecstuning.com/BMW-E90-M3-S65_4.0L/Search/SiteSearch/Steering_Trim/

I put in this and the fit was perfect:

http://www.amazon.com/AutoTecknic-Carbon-Fiber-Steering-Wheel/dp/B003QACOWS

subbedddd im going this soon to replace me wheel with the perf wheel