Quote:
Originally Posted by hapisok
im still waiting on my tune update for E85 which sshould smooth out any inconsistencies/changes created by the addition of the 25mm insulator. hoping to have results in the 290's...
this by far has been the best mod per dollar.
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E85 FTW
On another note, related to the topic, these insulators certainly do help to keep the manifold cooler aiding performance (power consistency)
However the main reason for the gains are the changes in the scavenging characteristics of the inlet manifold which are shifted to be more inline with the mechanical operating characteristics of the engine. This is based on Helmholtz resonance principle.
For some more detailed info check out the following links
http://en.wikipedia.org/wiki/Manifold_(automotive)
Helmholtz resonance - Wikipedia, the free encyclopedia
Hope this helps
Kindest Regards,
Steve