I switched to the poly mounts from Olthoff's aswell. But, after i cracked the fiberglass in the pipe cut out
. Good move to get that done.
Since your car is brand new, I recommend checking anything with threads regularly. If you see something loose, use a little blue loc tight to prevent loosening again. I had a throttle linkage, negative battery terminal, driveshaft bolt and maybe one or two others vibrate loose. As you can imagine the linkage and battery terminal left me dead on the side of the road. Luckily I found the nut on the linkage, dont know how. I was lucky enough to quickly fix the problems and get going again.
These cars are like helicopters, lots of vibration and maintenance. Its dangerous enough with out something falling off....
Enjoy your car, congrats!