The "stages" usually imply a more aggresive lift/duration which will give you a lopey sound depending on your choice. Different grinds are going to achieve different variations at idle and under acceleration, both power and torque. One set of cams can give you torque down low, another set may give you better HP up high. Some are ideal for N/A, some for boost, etc. There are as many variants as there are going to be flame posts for you.
If you chose the right cam, might I suggest a turbo charger?
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