V8R NA & NB Miata Frame Rails

Frame rails Gen 2 are rigid and heavy-duty compared to the competition. They are easy to install once you bend into shape your existing rails.

Holes do not line up. Should include exact size drill bit.

I purchased a set of never-installed Gen 1 rails secondhand from a local seller on Facebook Marketplace. He said a local shop quoted him $700 to install them, and it just didn't seem worth it to him. I'd been on the fence about installing them on my 1991 Miata, but I figured I couldn't go wrong for $100.

After I got them, I printed the instructions from the V8 Roadsters site. The instructions were vague in a couple of ways: 1. They just say to line the front edge up with a seam on the underbody, but there are a couple of seams. An image would be very helpful here. 2. There is no mention of what you're supposed to do with the brake/fuel line brackets. I determined that the small holes drilled in the side of the rails correspond with the threaded holes in the side of the factory rails, but after that I was on my own.

Additionally, the holes drilled in the Gen 1 rails were spaced at approximately 17.5", and the hole spacing on my car was 18.5". What I ended up doing was putting the passenger-side rail in place and marking the side of it using the bracket marks on the lines for guidance. Then I removed the rail and drilled fairly large holes in the side of it at the corresponding spots using a step drill. When I put the rail back in place, my holes *just* lined up with the threaded holes in the underbody. I installed the factory line brackets upside down, which spaced the lines away from the protruding bolts. I used fender washers between the brackets and the rails to provide a flat mounting surface (I didn't want the brackets to be partially in the step-drilled holes) and tightened them down with slightly longer bolts. In a few spots, I zip-tied rubber fuel line over the metal lines to prevent bolt-to-line contact.

Otherwise, the install went pretty smoothly. I purchased a new, high-quality Milwaukee drill bit prior to starting the job, and it zipped right through the floor. I painted the holes with Dupli-Color touch-up paint (BGM0388 is a decent match for NA6 Miata red) and put a bead of clear silicone around each hole before putting the bolts through. I feel rust prevention will be sufficient for a car that doesn't see winter weather.

Quality of the rails was good, as was the size and quality of the hardware. I wish it was metric, though.

As far as an improvement in chassis rigidity, on my car it was noticeable but not dramatic. It probably helps that my original frame rails weren't smashed too badly. Only the passenger-side rail required a bit of massaging. All in all, it's a modification I'd recommend, even at list price. Would I pay the $300 other companies are asking for their rails? No. I'd buy the V8 Roadsters rails, especially the Gen 2 version.

After looking through different options of frames rails from various stand points, none stood out to my attention like the V8 roadsters grame rails. The are very sturdy, and I highly recommend the coated finish set for a long lasting product. The even provide many locking nuts and bolts for installation. I will be making an install video on these on my YouTube channel, SongBird miata. They are a GREAT piece of art. 5/5 I'd buy them again if I went back in time to choose a set!

Comes with good hardware and a good powder coated finish. Great bang for your buck!