[10/10ths]

....you will just lose power.

The stiffer motor mounts trigger the knock sensors and the engine management will retard ignition timing to prevent what it thinks is detonation.

I’ve seen dyno tests to prove it.

I promise you that every Porsche out there with inserts or polyurethane bushings in their motor mounts now own slower cars.

So if you want more noise/vibration/harshness AND a slower car, by all means, send your hard earned money to the aftermarket purveyors who feast on all of the uninformed new Porsche owners who are now buying these old cars because they have depreciated to the point where they are cheaper than new Corollas.

You have been warned.

Just don’t do it.

Cheers.