Not true, MAC make automative longtubes: they put the o2 sensor bung on the opposite side so they face outward. For carbed homies, this is not an issue since you just plug the LT O2 sensor bungs anyways.
Yeah I forgot about the MAC ones being able to fit on the auto cars. I'm not a fan of the multiple flanges that seem to warp on everyone though. I don't know if the LT's are single flange or not. I haven't looked at them in a while. I also think the primaries on the MAC ones are too big for what I'm running. 1 5/8 is enough for me at the moment.