Originally posted by warmonger:
I'd bet my LEFT NUT that your 5HP increase was mostly from the the fact that the headers were tested at a temperature 20 degrees cooler than the other! That makes a huge difference by itself.
warmonger
I'm sure it made some difference, but the dyno operator did dial in different correction factor. On the 1st run, air temp was93.7deg, correction factor= 1.06SAE. On the header run, air temp was 76.4deg, correction factor= 1.00SAE
