Also worth noting, Dougs headers required a bit of massaging to get past the box. They fit the factory box fine.

I spoke with Borgeson a bit more on these boxes and the "tight spot" at center is a by product of them using used gear sets and tightening them up, same as what Firm feel does or can do. Borgeson guys said the tight spot would go away after the gears wore in a bit. It seems to me that unless you REALLY need the 12lbs off the nose or are converting a manual car to power; you can get to the same destination by having your box rebuilt by Firm Feel..