Why does HR not recommend bolt-on subframe connectors?
Bolt-on subframe connectors requires the end-user to drill holes into the chassis. This weakens the chassis. Additionally, the contact areas of the bolts do not approach that of a properly welded subframe. This problem is compounded by the fact that bolts are not always installed properly (perpendicular to the mating surface) and torqued to the required ft/lbs. As a result, bolt-on subframes do little, if anything, to increase the structural rigidity of the chassis.
