Viagra for your Miata! A simple piece but a very effective one. These braces slide over the factory frame rails and stiffen the car dramatically. The factory rails are easily damaged over bumps and mistakes when jacking, and every time they are bent the car gets floppier. Our initial testing showed a 30% decrease in twist and the car feels far more solid when it's being driven. Subjectively, our original test car felt as stiff as a 2004 Mazdaspeed when equipped with these rails. Ground clearance is unaffected and the total added weight to the car is just under 13 lbs. The rails and the fasteners are 14 gauge stainless steel to prevent corrosion. They're strong enough to act as jacking points as well.
Since their original introduction years ago, we've been working to improve them. The fuel and brake lines are now mounded to welded studs. The number of holes for installation has almost doubled, and even the length of the bolts has been fine-tuned to improve clearance in a tight spot. We've even managed to drop the price by 20%. Not all the changes are obvious, but they make for a better product.
To make your Miata even stiffer, we highly recommend our butterfly brace upgrade as well.
No welding is required for installation although 24 holes need to be drilled in the car. Fits all 1990-2000 cars as well as the 2001-02 cars without the Sport bracing. Sport cars and 2003-05 Miatas can use the braces although one of the factory cross bars has to be removed. The factory bar can be retained with a slight modification. If your factory rails have been damaged, they may need some massaging with a hammer to allow these to slip over top.
There are less expensive knock-offs out there. None have all the features of our originals, though, such as stainless steel construction and the cutouts for lower weight. Also, the FM rails are the only ones compatible with the acclaimed butterfly brace upgrade.