Lowering the ND Miata Seat (and Fixing the Backrest Angle)

The ND seat bottom is mounted high relative to the cowl. It’s the number-one complaint from tall drivers and, on track, it’s the inch between a helmet and the broomstick test. Three suppliers fix it: Jass Performance, Paco Motorsports, and Aurora Auto Design, dropping the seat anywhere from about 29mm (1.1”) to 58mm (2.3”). The catch most listings skip: lowering the cushion alone reclines you relative to the wheel and pedals, so on the deeper kits you also want a way to put the backrest angle back.

The short answer

If you want…	Pick	Drop	Verdict
The most drop on the OEM seat	Jass lowering rails	up to 58mm (2.3”)	Best drop. Adjustable; keeps fore/aft slide.
To keep the factory slider, cleanest result	Aurora Low Profile V2.0	~29mm (1.1”)	Best feel. Full factory function; you trim the base.
Lightest and cheapest	Paco brackets	~30mm (1.2”)	Best value. −6.5 lb/seat; fixed position.
To fix the recline after you drop the base	Jass backrest raising kit	raises back ~50mm	The second purchase most people make.

If you only drive on the street and you’re not unusually tall, you may not need any of this. If your head is near the header bar, you’re shopping for a helmet, or your thighs point up at the wheel, read on.

The stock ND seat sits high, and that’s the complaint

The factory seat bottoms sit high relative to the cowl, which puts tall drivers’ heads near the windshield header and tips the seating position knees-up. It’s the most common gripe ND owners raise, and base trims have no seat-height adjustment at all. Even the GT’s manual tilt only changes the front edge of the cushion, not the whole seat. The fix is a bracket or rail set between the seat frame and the floor that relocates the whole seat down. Owners describe the change as going from “riding on the car to sitting in it,” and tall drivers (6’3” with a long torso is a recurring profile) report finally clearing the roof in a hardtop or RF.

How far each kit drops you

The drop numbers are close enough that the differentiator isn’t height, it’s what you give up to get it.

Kit	Drop	Keeps fore/aft slide	Reversible	Notes
Jass lowering rails (standard)	33–48mm (1.3–1.9”), 5mm steps	Yes, they replace the slider rails	Bolt-on	Adjustable drop; OEM seats
Jass lowering rails (extreme)	58mm (2.3”)	Yes	Bolt-on	Deepest available
Jass fixed adapters	56mm (2.2”)	No, four preset positions	Bolt-on	OEM or Recaro versions
Paco Motorsports brackets	~30mm (1.2”)	No, loosen bolts to slide (~3 min)	Bolt-on	Lightest, −6.5 lb/seat; budget pick
Aurora Low Profile V2.0	~29mm (1.1”)	Yes, full factory function	Only if you keep the cut-off piece	Requires trimming the factory base

One number to ignore in the wild: forum posts citing a “2.5 inch” Jass drop are almost always describing the NC brackets, not the ND. On the ND, the published range is 33–58mm (1.3–2.3”) depending on which Jass kit you buy. An owner who fit the standard adjustable rails measured about 2cm of new headroom and called the slider retention “huge.”

Lowering the base reclines you, and you fix the angle two ways

This is the part nobody tells you before the first install. The factory backrest angle was set for the factory cushion height. Drop the cushion 50mm and your hips go down, but the backrest pivots from a fixed point, so you end up effectively more reclined relative to the wheel and pedals. The side bolsters, headrest, belt guides, and Bose headrest speakers all sit higher relative to your body than Mazda intended. Tall drivers feel it as “the bottom is right but the back is wrong.”

There are two fixes, cheapest first:

Release the backrest tension. The ND backrest has a spring tensioner; detaching it lets you lean a touch further back and frees roughly 25mm (1”) of felt headroom. One ND owner who ran the Jass adjustable brackets and released the seat-back tension reported going from having to scrunch down to passing a hand over his head and wearing a ball cap, while keeping the seat adjustable for other drivers. Jass documents the free 10-minute procedure, and there’s a matching base-tensioner release on the seat bottom that mostly softens the cushion; the Jass detail page covers what each one feels like.
The backrest raising kit. Jass’s backrest raising kit bolts the backrest up roughly 50mm to restore the factory relationship after a deep drop. It keeps the reclining mechanism and needs no cutting. One limitation worth knowing before you buy: it only operates from the point where the backrest is parallel to the rear wall and further back, so it cannot make the backrest more upright. A short driver who wants to sit forward and tall can end up too reclined. Like the rails, it’s sold per side.

Match the mounting style to how you use the car, not to the drop number. The recurring split in owner reports is slider retention:

Share the car or move the seat often: a slider-retaining option. Jass’s lowering rails are slider rails, so you keep full fore/aft travel; Aurora keeps the entire factory slider. One 6’3” owner ordered the Paco rails but switched to Aurora specifically because he “still wanted adjustability,” accepting that the Aurora “requires cutting some metal off the seat base.”
Set it and forget it: a fixed bracket. Paco’s brackets fix the seat in place; you loosen the bolts, slide, and retorque in about three minutes when a different driver takes the car. They’re the lightest and cheapest, and an owner who runs both Aurora and Paco summed it up: “Pacos are about 1/4 inch lower and the better choice if you don’t share the car. Auroras are a better compromise if so.”
Reversibility: Jass and Paco bolt on and come back off with nothing altered, which is why owners call them “returned to stock without too much hassle.” Aurora requires trimming part of the factory base to clear, so it’s only fully reversible if you keep the cut-off piece.

On price, the order is consistent in owner threads: Paco is the budget pick (roughly $179 for the pair), Aurora the premium one (owners report around $475 for the driver kit and report long lead times, so confirm stock before ordering). Jass ships from the EU, so US buyers add freight or source through a reseller like Moss Miata. Treat these as ballpark; they move.

On track, this is about the broomstick test

For helmet clearance, an inch off the seat is often the difference between passing and failing the broomstick test (a straight edge laid from the roll bar to the windshield header must clear the top of your helmet). The ND is short on headroom, so roll bar choice, seat height, and helmet bulk get decided together. These OEM-seat kits are the move when you want to keep your comfortable street seat and still fit under a bar in a helmet. If you’re going to a fixed-back race bucket instead, you use a Planted base with a side-mount or lowering bracket, which is a different parts list.

Installing them is a seat-out job

Every one of these requires pulling the seat first: four 14mm bolts plus the airbag and occupant-sensor connectors. Do the SRS-safe battery disconnect or you set an airbag light that won’t self-clear, and torque the seat bolts back to about 28 lb-ft (38 N·m) on reinstall since they’re structural belt anchors. The full procedure is in seat removal. Budget one to two hours per side for a first install; owners consistently flag that the bolts behind the seat back are the tight part and that the Jass sliders are “quite beefy” to maneuver into place. Most of the time goes to setting the drop and re-checking the backrest angle, not the fasteners.

Lowering the ND Miata Seat (and Fixing the Backrest Angle)

The short answer

The stock ND seat sits high, and that’s the complaint

How far each kit drops you

Lowering the base reclines you, and you fix the angle two ways

Owners pick by whether they share the car

On track, this is about the broomstick test

Installing them is a seat-out job

Further reading