I did the same thing on my 350. I not of a fan of ppf. Years past I've seen people have problems with it on their F cars. Everyone told me I was crazy for not doing it.
You should have kept it and just add the GT3 to your collection.
I've had a few Porsches over the years and I'm a fan. But, they seem to get boring after awhile because they do everything so damn well. You'll miss the drama of the GT350R.
Enjoy the GT3. The only Pcars I would keep now days...