Kenny Brown Extreme Subs Subframe Connectors

Subframe connectors are mandatory if you want your Mustang to handle. The world's best suspension system cannot properly do its job if the base chassis is flexing and moving all over the place. For ultimate handling, the chassis must be as rigid as possible. There's a reason why hard-core road racers and drag cars use full-tube frames--they're strong and stiff as hell. In the case of a street Mustang, the quickest, surest way to a stiffer chassis is with weld-in subframe connectors.

A Mustang is what's known as a unibody car. Instead of using one steel frame the length of the car, the Mustang uses a short front frame and a short rear frame. Both, known as subframes, are connected to the floorpan, but not to each other. A subframe connector does just that: it connects the front and rear subframes together, and that effectively creates a full frame, making the chassis stiffer.

Typically, subframe connectors bolt to the underside of the car and are welded to the subframes. That's usually all there is to it. But Kenny Brown has gone the traditional connector one better with the Extreme Subs System. They offer better triangulation to the chassis, which provides even more stiffness and strength over a standard subframe connector.

Kenny Brown's Extreme Subs consist of the standard KB subframe connector, a jacking rail, and an Extreme Matrix Brace to link the connector and jacking rail together. All three provide vastly more rigidity than just a simple subframe connector. All together, the Extreme Sub System sells for just under $300 for '79 to '93 cars, and about $330 for SN-95 cars. We watched as the Gizzi brothers at GRC Performance in Mission Viejo, California, installed a set of KB Extreme Subs on a Fox-body car.