I ran KW V3's on my G37 coupe for almost 2 years. This included on the road course, auto-x, track, but also on the highways(including a 4400 mile road trip down to ZdayZ in NC, Miami and back home up to MN).
After selling my G37 last October(sold the KW's) and purchased my Nismo this spring, I immediately was frustrated with the suspension. The OEM Nismo suspension was incredibly uncomfortable, the springs gave just no support, they were purely meant for track and track only. I immediately knew they had to go, and went right back to my #1 choice, KW V3's and boy am I glad I did!
I did the full swap in my garage, including SPC front and rear camber arms and toe bolts.
The 1 and ONLY bad side of these coils is they DO NOT come with pillow mounts or top hats, meaning you still have to dismount the OEM springs from the OEM struts, and reuse the OEM pillowmounts. I find this to be a small price to pay for such a high quality product.
^^^And the finished product! I have the rear coilover maxed out, which I LOVE that KW, as a class act company and the crowd/look they are directed towards, they limit how low they can go to a tasteful slammed look but not overkill.
Zero issues scraping, but I'm used to driving lowered cars. I also don't rub at all on my fenders, even with 15mm up(40-15 = 9.5+25 offset) front and 20mm in the rear(23-20= 10.5+3 offset).
The ride, just as I remember it! With a progressive spring, they give great comfort for everyday driving and dips, but when you start to get aggressive with them, they know right when to limit the car.
All in all, I give KW V3's a rating of 10 out of 10. It just doesn't get any better then this setup with the adjustability of rebound dampening, compression, and height.