Engine mount inserts ... don't !

[jaykay]

Been in a Cayman R with a semi solid mount and it was awful at anything other than 4K plus.....hard accelerateion / wot i can't recall as the fear of smacking the walls of Mosport was in me.

Generally, I would think the extra vibes you are going to get would be disruptive rather than help you on track. Just put the stock 987 one in there and all will be well

[Gelbster]

Ben's experiment/mod suggests that perhaps there was a manufacturing error in the molding of the insert ? For example, over filling the mold with PU foam.
Seems his vendor is not the only one to make a similar error.