1) What this guide solves
If you want a clean, frameless look and confidence that your plate stays firm at speed and in car washes, follow this step-by-step. It applies to the MagSleem series on standard grilles and Audi-style honeycomb setups.
2) Audi honeycomb grille compatibility: included kit & correct install
SleemPlate kits include dedicated hardware to clamp from behind the honeycomb cell (no drilling in the bumper itself):
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2 special screws + 2 nuts (for captive mounting through the cell)
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2 blocks that sit behind the honeycomb cell
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2 extenders when cells are larger
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For MagSleem kits: 2 puck extenders for the magnet pucks
Critical measurements & tips
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Puck diameter: Ø28.4 mm, extendable to 40.2 mm with the puck extender
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Block height: 36 mm tip-to-tip; we recommend 32 mm max honeycomb cell height without extender
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With extender, the system accommodates up to 40 mm; we recommend 36 mm max for best seating and retention
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All current kits are screw-mounted. Cross-head screws, no washers.
Quick steps (Audi – honeycomb)
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Pick two symmetric honeycomb cells that are centered/level.
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Place the blocks behind the grille cell and hold in place.
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Thread the special screws through the magnet+puck then into the blocks; tighten firmly (don’t overtighten).
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Snap the caps on the pucks.
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Offer the plate to the MagSleem holders; press evenly so both lateral points seat.
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For millimetric alignment, use SleemFix. (included in the MagSleem X kit)
Compatibility note: Target format is EU 520×110 mm. MagSleem X works with any plate size worldwide. Bumper material doesn’t matter (aluminum/plastic/steel) because retention is magnet–magnet via screw-mounted pucks. No issues observed with ACC/radar/parking sensors; don’t cover radar windows.
3) The simple physics (educational)
Dynamic pressure grows with speed:
q ≈ 0.5 × ρ × v² (ρ ≈ 1.225 kg/m³; v in m/s).
At ~300 km/h (~83.3 m/s), q ≈ 4,250 Pa. An EU plate area is ~0.057 m², so an idealized load is ~240 N (~24.5 kgf). Real cars have angles/turbulence and the magnets share the load across two lateral points / four magnets, so actual loads differ.
Takeaway: correct install + even distribution across pucks + sensible checks = real-world safety.
Note: simplified model for education; not a certification.
4) 10-minute real-world test protocol
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Static pull: tug at both lateral points - no play.
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Vibration check: light taps around pucks (no metal tools) - the plate shouldn’t flutter.
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Short city drive: 5–10 km on rough asphalt; re-check tightness.
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Highway, progressive: step up gradually (e.g., 100 → 120 → 130 km/h; 60 → 70 → 80 mph) with checks.
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Car-wash: keep the jet ≥30–40 cm and at an oblique angle; avoid blasting under edges. (Internal tests were OK close to ~20 cm, but keep margin.)
5) Care & best practices
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No maintenance required. Optional: quick rinse after salty winters.
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Avoid slamming magnets together (any magnet can chip under shock).
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Ensure the plate is perfectly flat for even seating and high-speed stability.
My panel is aluminum/plastic - will magnets “stick”? Yes, because SleemPlate uses magnet–magnet coupling via screw-mounted pucks. Panel material is irrelevant.
6) Troubleshooting
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Misalignment: use SleemFix or re-position pucks slightly.
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Chipped magnet: usually shock/over-tightening → replace the magnet (see Spare parts).
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High-speed flutter: re-seat so both lateral points bite evenly; ensure plate is flat.
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Aggressive wash: increase distance/angle; avoid direct under-edge jets.
7) FAQ (short)
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Will it fit my car? Yes. MagSleem holders are universal; honeycomb/aftermarket grilles have dedicated hardware in the box. For non-EU sizes, MagSleem X is compatible worldwide.
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Safe at speed / winter / wash? Yes—when installed correctly and with quick sensible checks. Real-world Autobahn, off-road and track use have been validated.
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Legal? Plates must be mounted in the designated front & rear positions and remain visible; correct installation meets those principles. Outside EU/RO, check local rules.
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Will it scratch paint? Pucks/caps are designed to protect; always install on clean surfaces.
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Warranty & returns? 2-year EU, 1-year elsewhere; 14-day EU withdrawal + 90-day satisfaction return if intact.