It's an entirely different beast. I had a 2015 GT PP, 2016 GT350 tech pack, and now own a 2017 GT350R. The sound and performance from a 350 is intoxicating. If you can make the switch I'd highly recommend it.
This is a common problem. It can be adjusted but will likely continue to sag over time. It's a poorly designed attachment between the bumper and fender. I had mine adjusted before I took delivery on both my 350 and 350R.
Use the paper clip attachment icon. It's under the advanced options on replies. That should open a second window where you can upload photos. Hope this helps.
So I've finally joined the forum after years of stalking it:) I brought home a GT350R after a painstaking search to find it. This replaces my 2016 Tech pack that I had delivered on 2-14-2016. #399 with electronics pack and car cover.