The Cayenne weighs around 2300kg and the Subaru weighs around 1250kg, how can you even look at them both and say they weight a similar amount?

One's an SUV and one is a coupe...

Straight line the Porsche Cayenne Turbo or GTS would leave the Subaru in it's dust, round a track you'd probably find it's a little closer if there wasn't too much open road. Though at best guess I still think the Porsche would win.
0-60 of the Subaru would be 6.2~ seconds, cost of about $30,000
0-60 of the top spec Cayenne would be 4.1~ seconds, cost of about $160,000
0-60 of a 2001 Honda Hornet 600 ~3.5 seconds, cost of about $1500
Granted there are cheaper cars you can get than the Subaru + Porsche which will do a 0-60 in < 6 seconds.