I have just been given the choice of two camshafts to replace the damaged on in my car. The earlier 05 cam versus the later de-tuned for emissions 08 cam has to deliver different results, but the HP and torque specs never change in the literature over the build dates for the car with the M130.980 engine.
For me the choice is economic as well because the earlier 05 would cost $200 more. I have heard that the ultimate is the 09 cam but I have heard the improvement is largely above 5,500 RPM.
So is there enough useful improvement to justify the extra $200?
BTW Thank you to Joe Alexander for the cam chart.