why not do this.....response to "The answer to Why Backpressure Doesn't = HP!"
 

someone with FLP's dyno with
1)cats+cutout
2)cats+catback
3)OR pipes+cutout
4)OR pipes+catback

-----then post the results. Now i know from reading the post tuning witha little MAFT would effect the open headers and burnt valves argument. But testing those in a row would do something.