Subframe connectors

Personally, I feel that welding 'em in is easier and better to do. Drilling for the bolts, it's very difficult to get the holes so that the bolts fit in with no play at all. Even with the bolts ratcheted down tight, there is likely to be some movement because of the tremendous rotational torque applied to those areas. Plus, in my case, I used the subframe connectors as an anchoring point to attatch the roll cage behind the front seats.