I haven't seen the TST plate, so I can't say for sure which one it is closest to. I have been told by some people that it is very similar to a 10 (which I could easily believe due to the extremely high EGT's I say with it in the stock position). DBR recently sold one on Ebay as well and he said it was equivalent to an 11, so I went with the more conservative of the two choices. I know that I had to back it off about 50 thousands with the stock injectors to keep EGT's in line, and backed it off even more since I got the bigger injectors, so it seems to be a pretty serious plate.