I measured it with a digital caliper and thats what it is.
I am not going to take the thotle plate off to measure.
If i strip one of the scews im pooched.
Not sure where you got your specs because Dinan dose not list them.
When this was on my 2.8l motor I had much faster throtle responce.
As for horse power I don't think anyone can feel 5hp.