DEI NA/NB insulation kit
DEI NA/NB insulation kit
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Description
Miatas are great, but they're not exactly quiet cars. This kit won't turn your Miata into a quiet Rolls, but it's a good step in the right direction. This kit, from DEI, uses their Under Carpet Lite insulation, which is a 1/2" thick multi-layer composite material specifically designed to absorb sound and insulate against heat. They take that fancy material and CNC-cut it to custom-fit the NA and NB Miatas. Small variations in the years (e.g., ECU location) are accounted for by scored lines that are easy to cut if you need to remove material but strong enough to hold everything together if you don't.
This kit is intended for LHD (left hand drive) cars, although it should work on RHD cars if you're willing to trim the insulation as needed to make it fit. Please note that it's not pre-scored to address this.
Covers the floors, transmission tunnel (except under the dash), rear bulkhead, and rear package shelf. Easy install - remove the seats, pull up the carpet, slip this into place, then put it all back - no dash removal required. 7.25 lbs total, so a trivial weight increase. Be sure to add the Boom Mat sound damping kit for the best in sound deadening.
How much quieter is it? That's a surprisingly tough thing to quantify. While the decibels do decrease, it's not by much - the biggest difference is that the harshness and tone of the noise is much decreased / improved. That's a tough thing to quantify, but it does make a big difference to how pleasant the car is.
Instructions
Shipping
What does it fit?
Emissions
Emissions do not apply.
Warranty
lifetime
SKU
Really thick and durable product. Easy installation, as long as Mazda doesn’t over torque the seat bolts like mine were. That’s why they make impact tools. The only difficult part was getting the carpet out from under the gas pedal. Patience. Pushing the insulation up the tunnel was easy. A flat tool helped. Will see how more quiet and warm/cool it will be.
Just installed the insulation kit, it made a nice reduction overall in noise and heat transfer to the interior. Didn’t stop the heat completely, but reduced it by about 60%. It was very straightforward to install, and with a little work and an interior trim removal tool, I was able to work the insulation all the way up the sides of the tunnel; well worth the effort. Very glad I did this kit!
Did this with the DEI chassis + door sound damping kits. It's so worth it if you drive the car on highways for any significant distance. Leaving aside exactly how much noise it cuts, I feel a lot less fatigued at the end of those 300-mile stretches.
It is a bit difficult to reinstall the interior with this, since the extra material puts a lot of strain on 20-year-old trim pieces and especially trim pins. It is doable, though.
Totally worth it.
Pretty easy, just tedious install. I combined this with the boom mat kits for the door and chassis and my car is much more of a pleasant place to be, even on the highway, where I spend a lot of time.
I'd set aside 4-4.5 hours or so to do this, being generous. I blew through installing this and the boom mat kit, as well as the isopropyl alcohol cleaning and vacuuming in around 3-3.5 hours. If I took a bit more time, I could've added more of the tape (or even my separately purchased amazon branded sheets which are thicker, maybe wish I did) to the tunnel. I think there's definitely enough space for some more material there, but oh well. I used those amazon ones in the trunk which is another spot for sounds to come through.
One thing I will mention though, is that the carpet behind the seats that lays vertical will only clip in with the top clips, the bottom 4 wont go back in because there's no holes in the DEI insulation for some reason. No big deal, only need the top 4 to go back in, but now I have extra clips. Also, the seats may be a bit annoying to reinstall at the end, because the extra stuffing in the tunnel makes it hard to slide the seats back and forth without them becoming misaligned when you are bolting them down.
I'd definitely recommend it overall. If you're not a straight up race car then this is so worth it.
Installation wasn't too hard and the fit was perfect. There were a few carpet clips that were missing holes, but they didn't really affect the install so I just left them off. The material was easy to cut and fit to my roll bar - I used my already cut carpet as a template for where to trim the insulation. The transmission tunnel bits were pretty easy to install, after a few drives the material there settled(the carpet was a bit puffy by the gas pedal). I paired this with the sound dampening kit for the chassis and the doors. Road noise is definitely reduced, I'm glad I can talk to my passengers now without having to yell over the noise. Even with stiffer motor mounts and polyurethane differential mounts, I still find the wind noise made by the hardtop to overtake the road noise. I was surprised to hear a whistle coming from the bottom of my window where my hardtop seals! Looks like I've got my next project cut out for me. I would recommend this for hardtop users, as I don't notice a big sound difference when I'm driving with the soft top on.