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Have you done anything to your exhaust?
The reason I ask is because I have experienced a similar situation when I built a custom x pipe with duels. It seems that while it may have flowed well I lost...

I had the same problem. the trans output channel is correct. i contacted HP on a ticket and they verified that the speedo is taken using the wheel sensors(ABS Trac con) and not the engine management....

Any word on these tables? just wondering? this thread is about 5 years old and reading through the posts it was supposed to be on the "to do list"

Eric tables?