I’ve been following this thread for the past couple of days and I’m pretty pleased with the response the K04 manifold is receiving
The porting work on your manifold Ed certainly has voided the warranty but it’s all in the pursuit of hp so it’s all good
spartiati : are you any further forward with getting the logs for the software tech to look at?
As for 3 UK cars I only know of 2 which are on the same software done by the same company
We did have a customer based in central Europe tuned by JD Engineering that reported 'breakup' at high RPM but that turned out to be his fuel (E85) as the car was originally mapped on high octane unleaded, this 'breakup' has now since disappeared. This very customer is producing a healthy 317bhp (a little less than you guys on the F23's)
Looking at some of the discussion regards merge collectors we did extensive testing to ensure the flow was optimised and we saw no port sharing throughout the testing.
I look forward to seeing the outcome of some of the installations, especially yours Ed