RoadsterSport 6 Piece Complete Underbody Brace Kit

Wow. The car is certainly stiffer; instead of flexing when the front right jacking point is used, the front left, front right and rear lift off the ground. As far as handling / response, the car feels flatter entering corners and applies power out of turns. Very nice investment.
One critique: the hardware. My 12mm bolts did not withstand the 20 ft/lbs (applied with digital Snap-On) and sheared off inside the insert. Made an easy job a real pain.

-- Steve J., Alabama ( 2014 Club ) September 2023

This is The bracing kit to get. I already have the Ohlins R&T from Goodwin and that alone transformed the car (7/4 track/canyons so far, street 12/9 mostly) But, this bracing kit transforms the NC into an incredibly solid platform all over again. Turn in is sharper, rotation crisper, handling in general is just predictable and precise. And, it lessens or stops the odd rattle or squeak here and there. Just a totally different NC. Opposite of the ‘boat’ nickname.
I have driven several drivers cars and this handles better than any stock S2K, my other favorite. This kit from Goodwin (only place I found it) is a must have investment if you intend spirited, or 10/10ths driving) And this car is my daily too. This is the way the engineers and developers intended the horse/rider experience from the MX5, imo.

2006 NC1 GT manual soft top
Strut brace Cobalt front
FM sways
RPF1’s
Ohlins R&T
Rotors calipers pads steel lines
Goodwin CARB exhaust header and mid pipes
FM muffler
9lb lithium battery
Goodwin SCCA roll bar (back ordered till 1/23)
Mild Stage 1 cam (. “ “ ‘)
Italian horn(heehee)
Cipher flat bottom steering wheel
Lighter seat coming soon.

-- Eric J., Santa Rosa Ca ( 2006 nc1 gt mx5 Ohlins ) November 2022

I can't believe the difference this kit makes. The car is much stiffer and more responsive. Well worth the money.

As an aside, the guy who schedules all of the maintenance at the shop races Mustangs. He said he'd never considered racing a Miata until he drove mine with the braces installed. He's now seriously considering switching cars.

As always, well done!

-- William K., Clinton, CT ( MX5 2013 ) November 2022

Love this bracing kit. It does make a big difference. This is how the car should have come out of the factory. The kit is very well made and is light. I have a benchmark corner that I have done many times before installing this kit. It's a high speed off camber corner and when you hit it hard, if felt like the car was flexing quite badly. It was this car flex feeling that made me decide to get a bracing kit. Testing the car on the same corner with this kit and it is much better. The car sits much flatter and leans on the outside wheels more evenly - just as you would expect it to. It inspires confidence in the way the car feels and handles.

This kit doesn't come with instructions so you need to follow the instructions that are on the forum. https://www.mazdatalkforum.com/viewtopic.php?p=18978#p18978

The only issue I had during the installation was with the triangle rear brace. It was hitting an existing brace. I had to cut and file the existing brace a little bit. This is because of the height of the existing brace stops the triangle brace from sitting flush with the bolt hole.

Also, one thing that wasn't mentioned in the forum install notes is the need to remove the OEM "X" brace. Because it still fits with this kit I put it back on.

-- Mark P., Sydney Australia ( NC 2008 ) August 2022

Requires normal patience. Hardware for each part is attached with the exception of bolts that are reused from car. Well made, easy to install. Big difference in body stiffness. Good modification.

-- Bob T., Virginia ( mx5 ) May 2021

The install was pretty easy. Not as bad as the header actually.I had a 1/2"w. X 5" long piece of universal slotted bracket. Cut off the tip to the opening and flexed the tip 1 up, 1 down, place the T bolt in side ways and straightened it up. Caught the bolt perfectly. Push it through the hole CAREFULLY, drop it through,grap the bolt tip and pull the metal out. I had to add 3 washers on the Y rear brace at the suspension sub frame for it to clear the brackets. Finished as directed on the install of this forum.
It really tightens up the car. Makes the steering heavier. Cuts out the "darting on tar strips. No clearance problems so far, stock suspension.

-- David r K., Rochester NY ( '13 MX-5 6MT PRHT ) September 2016

Attended MATGAP Tail of The Dragon with upgraded sway bars and full chassis braces. NO adverse highway ride, 400 miles of interstate. Felt really good doing the Dragon.

Thinking about upgrading front tower brace to get the tight feel my NA had with upper and lower braces.

-- Roger M., Fort Wayne, IN ( NC 2010 Miata ) August 2015

Import Doctors, Fort Wayne, installed frame braces for me today. Can feel the difference already, really stiffens the car.

Will report after a run on one of my favorite roads. The racing beat front and rear sway bars really work without harming the ride.

-- Roge M., Fort Wayne, IN ( 2010 MX5 ) April 2015

Parts came today, will install next Wednesday. First step was front and rear sway bars, Racing Beat. Can feel improvement and no ride issues.

-- Roger M., Fort Wayne, IN ( NC 2010 Miata ) April 2015

GWR chassis bracing kit
Very confidence inspiring.
The kit has provided a noticeably buttoned down feel to my '06 MX-5. Steering feel, with both input and feedback, is more precise, accurate. Instead of feeling like different areas of the chassis are responding slightly out of sync, the whole car reacts in unison. This is without any other modification to my car. The rest of the suspension is stock with 55,000 miles.
I went with chassis bracing first to more accurately see how much of a difference it would make. (I later added RX-8 anti-sway bars and the Kansei FSTB. Next up are Ohlins coilovers!)
Another benefit I noticed is that the tighter chassis makes for less wasted effort. The bracing makes me feel like I don't have to compensate as much as with a "looser" car, which makes the handling better AND more comfortable.
I can feel this affect at slower speeds, too. Higher speed transitions are even more relaxed and smoother. All this adds up to more enjoyment with less effort.
The pieces appear stout and nicely finished, very lightweight.
Installation was straightforward, but I highly recommend NOT using the bolt grabber Brian includes but instead wrapping the included bolts with flexible wire to fish through the frame rail, then removing the wire from the bolt once it is in place. This will more safely prevent you from losing the bolts in the frame rail.
Highly recommended addition!

-- John K., Central Coast, CA ( 2006 MX-5 ) February 2015