I don't see a big deal with those manifolds. I clearanced mine, too, although mine might have been the CB Perf. “El Cheapo” versions. And then I went for the super-slim nuts, too. IIRC, mine take an 11mm wrench. Three of them will accept a box end on the wrench Or a socket, but the fourth has to be either a Super-slim-wall 11mm socket or an open end stubby wrench (my personal favorite for turning the nut one flat at a time). It’s part of the price for the fame of having a “racing set-up” like the PCA guys have.