Out of curiosity what are the cost differences

Alright, thanks guys.
I have a plan now, I know the track boss.
I'll talk to him & let him know what I'm thinking.
I am planning to get the cage certified to 8.50, if I end up replacing my floors I'll add in the few extra bars that would be good for 7.50.
But I think running low 10s consistently sounds just fine for me. The funny thing is when I see a low 10s car I say, **** that's fast enough