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Flyin' Miata NA/NB frame rail reinforcement kit

Flyin' Miata NA/NB frame rail reinforcement kit

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Flyin' Miata NA/NB frame rail reinforcement kit

Increase your Miata`s stiffness by 30% with our stainless steel frame rail reinforcements. Make an old Miata better than new.

Exclusive to Flyin' Miata!

Availability: In stock



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.

Additional Information

Additional Information

Part number 13-69010
Fits: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004 (non-MSM), 2005 (non-MSM), MSM
Manufacturer Paco Motorsports
Flyin' Miata exclusive Yes
Fits Exocet? No

Customer Reviews 7 item(s)

Buy these rails bro
Just put these on with a hand from a friend. BUY THEM. The car feels so much better. Potholes and rough roads are totally soaked up and the car feels at least ten years newer. If your thinking about the other guys frame rails remember that these have the butterfly brace that can be put in later, come with a sweet FM sticker, and look genuinely more BA than the competitors
Review by Brady / (Posted on 5/31/2016)
Who doesn't like a stiffer chassis?
Like you, I've read all the reviews and great things to say about these frame rails. However, I never rode in a Miata with them installed to make a comparison. After much research, I pulled the trigger on these and added the butterfly upgrade.

The install was straight forward and is quite easy with two people, one drilling from under the car, one above placing the nuts and bolts. You can actually see the floor pan get squeezed in a bit when you tighten the nuts. I sprayed some rubberized undercoating into the drilled holes and on top of the bolts. The butterfly piece takes a bit of fiddling to get it to fit, but it fits properly when you have everything else in place. Overall took about 4 hrs to do including removing and reinstalling interior pieces.

The difference is drastic. The chassis is tightened up and bumps are soaked up. What felt like a floppy chassis shake on my 15 yr old NB1 when going over bumps is now a solid "thud". Bumpy roads are still bumpy, but the feeling on the highway is also more composed.

I would definitely install these again if I had to.
Review by Mike / (Posted on 8/14/2015)
Huge difference in perceived rigidity/solidity
So... embarrassingly, I had these sitting in my garage for a long time before I got around to installing them (I ended up having a friend with a shop help out so we could use his lift). I haven't done any performance-oriented driving with them yet, so can't speak authoritatively about that aspect, but I can tell you that I had an immediate "WOW" moment when I drove the car home on the truck-damaged surface street between his shop and my home.

I'm always wary of confirmation bias in such a subjective review, but I've been driving this car for 25 years (since new), so I'm pretty familiar with how it shakes and rattles on bumpy roads, and there was a LOT less of that. I felt like more like driving my wife's new Audi down that road than my OLD miata. It was similar to the difference/improvement made by my previous upgrade to FM springs and Tokico Illuminas (plus new urethane bump stops from another vendor).

No downsides (except I'm glad I didn't lay on my back for hours under jackstands to install them); highly recommended.
Review by Pat / (Posted on 8/7/2015)
Frame Rail Reinforcements are a winner.
Finally got around to installing the frame rails last month and I love them. IMHO the reports of improved ride quality over bumpy roads are not exaggerated. My ’94 did not have any squeaks or creaks that I noticed (old guy here that tends to crank up volume of the classic rock FM station, FM cat and catback installed) so I can’t comment on any body noise improvement.

If you massage damaged stock rails with a hammer you might get showered with beach sand. Previous owner had driven my Miata on the ocean beach. I bought my Miata over 5 years ago and was amazed on the amount of fine beach sand that I had to flush out of the driver side stock rail. Beach sand was no longer salty but I imagine the sand was at least a bit abrasive as it shifted a bit while driving. Might be wise to flush out the stock rails and maybe squirt some sort of undercoating in them.

I was going to mount a vise on my floor jack to straighten the damage on stock rails but tried a cheap Harbor Freight C clamp with a short piece of wood first. Stock rail metal is soft so the C clamps easily did the trick.

If you are hesitating over buying the rail reinforcements I suggest you just go ahead and do it.

I keep wavering about ordering the butterfly brace upgrade, actually ordered and canceled before I installed the frame rails. Now I am back to thinking I will add the butterfly brace in the future.

I would buy the FM rail reinforcements again.
Review by dmcfz30 / (Posted on 7/13/2015)
Frame brace
Installed these on each of my Miata's ('90 stocker and '05 MSM). Have hardtops on both with usual hardtop squeaky noises on bumps. Frame rails noticeably reduced these noises as a result of much less body/frame flexing. Significant gains on rough roads. Totally happy with these. Special thanks to Brandon for his "shop tour" and technical help during my recent visit.
Review by mtn-miata / (Posted on 6/8/2015)
At first I was hesitant, but these really make a difference.
I am no longer afraid of potholes! These really stiffened up the chassis and it rides much better in corners and rough pavement and bumps. I no longer cringe over potholes or entering driveways at an angle. Body feels much tighter and responsive. No more creaks in the dash. I have vmaxx classics and FM sway bars and noticed more body roll after the frame braces I assume because the chassis isn't twisting as much and the suspension is doing more of the work. I love these things the bonus features is the stainless construction and they can be used as jacking points. Very straightforward install.
Review by VonMoldy / (Posted on 5/16/2015)
The least expensive and most effective handling upgrade
Frame rail stiffening immediately changed the attitude of the car. It tightened up a floppy 20 year old chassis better than almost any other mod for me. The install was straightforward and the fit was perfect. The only problems you may run into is if you have deformed frame rails from speedbumps but they are easy enough to manipulate back into shape with a hammer or other large tools. We paired these with a set of sway bars and now we can't take a corner without grinning.
Review by Werdna / (Posted on 3/20/2015)
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Why stop here? Consider this upgrade.

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