The S65 is argueably BMWs best engine...maybe the best theyve ever built. IMO, that means you need to compare it to Porsche's best, or one of its best. The 3.6 liter 997.1 GT3 engine was a marvel (415 hp), the 3.8 liter engine (435/450 hp) was even better, and the RS 4.0 engine (500 hp) is simply nothing short of a masterpiece that few engines can match in any aspect under the sun. Those 3 engines provide it all from smooth linear power delivery to top end pull, torque, sound...you name it.
This comparison makes no sense really...you cede the 3.8 liter in the 991 is a better engine, so you pick prob their worst engine to compare to BMWs arguable best...what good is it comparing if youre not apple to apples on best vs. best?
I can understand not comparing to the 4.0, thats just unfair, but the 3.6/3.8 would be essentially what would be apples to apples.
Last edited by Wolfinwolfsclothing; 10-09-2012 at 12:32 PM.