A PCI Racing sliding sub frame for the BMW M4. Part number SM-S1-M4.
On an M4 the factory seats are worth serious money, particularly if the car has the buckets, and the first thing worth saying is keep them. This mount bolts to the factory seat mounting points, so the originals come out whole and go back in when the car is sold. Nothing else you do to an M4 is as easy to undo.
The slider
This is the slider version, so the seat moves fore and aft after installation. PCI’s S1 slider bolts to the base with four bolts rather than the two a conventional slider uses, which they describe as twice as strong as two bolt mounting.
Most M4s are still road cars, so the ability to move the seat is usually worth more than the small height saving an adjustable mount would give.
Construction
Laser cut and CNC formed from a single piece of 1/8 inch carbon steel, with bends placed to add stiffness where thicker metal would otherwise be needed. Gloss black powder coat, grade 10.9 8mm hardware, five and six point sub belt mounting locations built into the mount.
Ordering
Side mount, for a competition bucket. Handed, so order twice for a pair, or take the pair listing.
Tell us about side airbags before you take a factory seat out.
Have you written anything about this exact product?
Yes, we have covered this exact product: How to Get the Clubsport Look in Your BMW M4, and Cobra Nogaro Circuit Bucket Seats Fitted Into a BMW M4. That is first-hand coverage from our own builds and showroom, not brochure copy.
Will this fit my car?
This frame is made for the BMW 4 Series/M4. Chassis code and years matter more than the badge, as floor pans change between generations, so if your car sits near a changeover year, send us the registration and we will confirm before you order.
Which seats does it take?
Check the bolt pattern in the specification against your seat. The Compatible seats tab above lists what bolts straight on. If your seat is not listed, tell us what you run and we will confirm the fit.
Do I keep fore-and-aft adjustment?
Only with a sliding runner between the frame and the seat, which is a separate part on PCI frames. If more than one person drives the car, budget for the runner. Our guide to sliding runners explains the options and widths.
Base mount or side mount, and does it matter?
This is a side-mount frame: the seat hangs between side brackets bolted through its flanks, the motorsport-style stack that gives fine height and angle control. Our guide on base mount versus side mount explains the whole fitting stack.
Is this for the driver or passenger side?
Both sides are available on this listing, pick driver or passenger side at the point of order (sides listed are for right-hand-drive cars). Left-hand-drive car? Ask us, as the sides swap over and availability varies by model.
