Good to know how did they effect egts and spool time?
EGT's are the same, spool feels tad better but it's very difficult to tell since I changed 1500-2000ft in elevation when I swapped them on and we did not log spool time before. Haven't been back to the good air with them yet.
The data Leen has on them from an engine dyno compared to cast manifolds shows a touch more hp and a tad less drive pressure back to back. So I would assume the scavenging effect is helping somewhat. Biggest benefit I have seen is they have not blown gaskets with numerous pulls and some dyno time. They are holding up very well for us.
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