Out of curiosity what are the cost differences

Cost differences Between a 10 second car and a car in the 9s ?
Nhra license.
More sfi certified parts ?
Nhra Cage certification.
There probably some other things I'm forgetting but I just want to know if anyone has recently gone from 10s to 9s and what was different.
Thanks guys.
I'm thinking of going through my heads and porting and installing my solid roller that's a bit closer to what my engine wants. 272-284 @.050
Vs. the 264-268 @.050.
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