Perhaps I am too late with this information respectively posting this link and you all are aware of it.

http://www.revhang.altervista.org/
In my view an interesting read about the issue and the possible solution of rev hang.

In the last post of this thread the guy tells the costs.
http://www.ozhonda.com/forum/showthread.php?187455-Rev-hang-a-curse-or-blessing/page2


I have no connection to him and I do not know if it works properly, but it could be an elegant solution by not altering anything else at the engine or the ECU.
I have sympathy with all drivers who suffer from rev hang because my 2008 Roadster, even with cable TB, was a pain before I got a new ECU under warranty therefore my interest in this topic to help to find a solution for you 3.7 Roadster drivers.



'14 4/4 graphite grey