Thread: Anyone measure primary size of speed daddy? (search had conflicting results)

That's what I was thinking was 1 5/8 since they are based off SLP... but then I see people saying they are 1 3/4 since ssac claim that size. My guess is as usual people don't know how to measure tubing. Since internally (obviously depending on wall thickness) it seems 1 3/4 is almost 1 5/8 and internally 1 5/8 is almost 1.5 which I've seen all these measurement guesses on the same header.