I'm the first set-up with Tanabe Sustec Pro's and My 2012 G37xS Coupe (Red) Drop is 1" and just over 1" in the back...had my Infiniti dealer installed them and spec'ed them...the wheels were balanced and the wheel alignment done. There's a bit of negative camber in the back however it's not enough to require a camber kit and the car is still within spec. It's basically 5% stiffer than a stock S and the stance is beautiful. The ride quality is good too. I'm on Yokohama 245-40-19's all around....Wanted wider tires for the rear however good thing that I didn't so that I can do a rotation. Part Number TNF 130 NF 210....NF stands for Normal Feel. The vendor that supplied them was a friend of mine up here in Montreal, he's a parts disti and has an account with Tanabe. After almost 8 months (no winter driving) I find the ride is quite good however any sports car setup on Montreal roads is going to be a rough ride. A bit more road noise that may be because of the wider/lower profile tires. Otherwise the handling and stance is amazing.

 

Pics or it didn't happen

 

I've had the Sustec pros on my car for about 2 years.

No issues at all.
Pretty close to stock ride comfort

 

The TNF 130s have been out for a while now (at least 6 years) and they use the same part # for all 2nd generation Gs. Only downside for some applications is the rear drop is a bit more than the front sometimes, but here's a thread on that
http://g35driver.com/forums/v36-brak...-too-pics.html

 

Got any pics of this drop on the X coupe