I thought the difference between headers was 26 hp and the additional 25hp came when you removed the dyno exhaust. I might have that wrong. How exactly did you test that?
That's correct. I think a great set of headers could be worth another 25 hp is what i meant.
We did a few tests after break in and the tune was where it looked good.
Then swapped headers added 26 hp. Then I noticed something and wanted to see if my theory was correct and that's when I decided, unhook the Dyno exhaust and run without. That was 25 more hp