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I'm gonna have some fabricated this week. I would think about 1.5 inches. The tips can be adjusted to your liking via the 3 Allen bolt adjustment screws.
I've seen a few people who have the same issue. So it seems fairly wide spread. You think Motordyne would fix this issue after being asked the same question after every exhaust purchase.
If yours is the same as mine, which there is a high chance it will be, you will need a drivers side extension. The passenger side tip will slide out about 1.5 inches farther than the drivers side.