Performance autos require sub frame connectors to strengthen the unibody.
One of the problems with unibody constructed performance autos is the inherent weakness and flimsiness of not having a true frame support. The stress of torque coming from the motor. In your high performance auto like the Mustang, Cobra, and Mach 1, oh yea lets not forget Chevys line up the Camaro, Corvette, Pontiac Firebird, Trans Am, and GTOs. The stress from the torque coming from the engine over the course of several years. Weaken the auto and causes flex.
With the lack of rigidity causes the surfaces to stress crack in the torque boxes, floor-boards, shock towers, c-pillars, roof, and virtually every other areas of the car. As if this weren't enough, the handling and ride characteristics suffer as well. Especially in a high performance auto's. Were the stress levels are several times that of a normal everyday auto.
Fortunately the future of your unibody Ford doesn't have to be so bleak! There are ways to strengthen and stiffen the unibody design so that it resists flexing and twisting caused by the torque of the motor. One of the most popular and easier of these modifications is to install a set of sub frame connectors.
Sub frame connectors have been around as long as unibodies have, but the designs have improved significantly. Most sub frame connectors will virtually eliminate chassis flex and greatly improve handling whether your car is setup for open track, drag racing, or just daily driving. The sub frame connectors strengthen the structure of the body, reduces the amount of body twist that occurs, and is instrumental in tying the suspension together. A noticeable improvement will be detected in both handling and unibody damage that are directly related to racing.
Several different types of sub frame connectors are available, but the best ones for preventing twist are the ones with a round tube design as opposed to the rectangular ones that are made of bent steel. These connectors are made of either the standard mild steel or chrome moly alloy steel, which is stronger than the mild steel yet, does not add any additional weight.
Any product that keeps your suspension in tact and prevents your car from stress cracks and twisting and flexing around corners or at high speed or on a launch is well worth whatever price you have to pay. Safety and the performance of your car always must take priority.
555-5310- 1979-1993 Ford Mustang Steeda 4130 Alloy Subframe Connector (Bolt or Weld-In) 555-5320- 1994-2002 Ford Mustang 4130 Alloy Subframe Connector (Weld-In) 555-5330- 1996-1998 Mustang Cobra 4130 Alloy Subframe Connector (Weld-In) MMFL-2PC- Maximum Motorsports Full Length Subframe Connectors Powdercoated Black - For 1983-1993 Mustang Convertibles 555-5245- Steeda Full Length Subframe Connectors 1979-2004 Ford Mustang 555-5246- Steeda Zinc Plated Full Length Subframe Connectors 1979-2004 Ford Mustang
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Several different types of sub frame connectors are available, but the best ones for preventing twist are the ones with a round tube design as opposed to the rectangular ones that are made of bent steel. These connectors are made of either the standard mild steel or chrome moly alloy steel, which is stronger than the mild steel yet, does not add any additional weight. 
