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The way i always see it is what make the most power per dollar.
Cold air intakes for example. Spend $500 to $900 on cold air intakes to get maybe 12hp. Where you can spend that same amount on a tune and get double the power.
If you break down dollar per hp for any mod you can do the put them on a list broke down like that. Of course you wont really know exactly how much each one will do or how much one mod will make the other mod work better but just for a rough idea. It usually makes boost show its real value if you have it laid out like that.
Cam is usually pretty good dollar per hp vs heads. Add boost and heads dollar per hp is going to be less worth it. E85 will beat out heads easily. Add boost and e85 is even more worth it.
You also need to consider is this upgrade replacing a part that really is limiting power? Just because new heads are available do you even need them? Are you're ports so small they can't flow enough air? Is the valve size actually limiting volume? If you increase volume and decrease velocity will it make the new head less effective?
Also if you have more power can you get it to the ground? Or is beating the numbers on a dyno what you're chasing?
Break it down using logic.
1: dollar per hp
2: mods that support other mods
3: parts that are actually limiting power.
4: will more power actually make your car faster?
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