Subframe connectors, bolt-on, 4-point, non-convertible onlyBolt in subframe connector Reduce chassis flex and increase handling and performance on your 4th Gen GM F body with four point bolt in sub frame connectors from BMR Suspension. The F body chassis flexes dramatically, even with mild amounts of torque and horsepower. BMR's F body sub frame connectors are manufactured from a mix of heavy duty 2 x 2 inch, 0. 083 inch wall and 1 x 1 inch, 0. 083 inch wall square steel tubing, with laser cut CNC formed 3 16