The install is pretty damn straightforward, theres actually a good writeup on the other board.
The mirror dims to reduce glare and it also has the homelink functions so it can replace your garage door openers.
Bought this used from another forum member a couple weeks back, decided to sell it instead of throwing it on. Likely going with a CP-E downpipe instead. Looking to cover my cost which was $100, so $100 shipped takes it. Paypal accepted and prefered.
Edit - this is the 2.5" version
Bought this off ebay a month ago, decided not to install it. I have a Mazdaspeed 6 and for the Mazdaspeed 6 the mirror button is slightly different than other 6's. Non Mazdaspeed 6's this should go right onto your mirror button, but I have included a new mirror button kit that can be used on any...
Brand New Cobb TIP MS6/MS3 Sold
Brand New, fresh from the vendor. I ended up getting a Speedie6 TIP instead so I never installed this. Cobb Blue, instructions, clamps. Sold