4 - stock
6 - FabSpeed exhaust only
10 - FabSpeed catless headers, SRP 4.1 and STOCK exhaust
12 - FabSpeed catless headers, SRP 4.1 and Cargraphic Sport exhaust
Hope this helps as you make your choices. I do wish that dyno 10 were broken out between SRP and headers. But there is only so much time.