H&R Sway Bar Kit – BMW 320i/328i/330i/340i (F30, N20/B48/B58) & 428i/430i (F32, N20/B46) RWD

OVERVIEW

H&R's matched front & rear sway bar set increases torsional stiffness over the factory bars on the rear-wheel-drive F30 sedan and F32-family coupe/convertible/Gran Coupe, reducing body roll and sharpening turn-in. The front bar is two-hole adjustable for street or track roll-stiffness tuning.

H&R sells this as a single part number across the RWD 320i/328i/330i/340i (F30) and 428i/430i (F32/F33/F36) — these share the same front/rear suspension geometry and subframe mounting points on the RWD F3x platform.

SPECS

• 28mm front bar / 20mm rear bar
• Front bar is two-hole adjustable for street/track roll-stiffness tuning
• Larger diameter than the factory bars for reduced body roll
• Includes H&R mounting bushings and hardware
• RWD-specific geometry — not compatible with xDrive models

PARTS INCLUDED

• Front sway bar
• Rear sway bar
• H&R mounting bushings and hardware
• Installation instructions

TECH RESOURCES

Additional Parts Required

• None. H&R includes the mounting bushings and hardware needed for installation.
• A four-wheel alignment is recommended after installation (service, sold separately).

Installation

• H&R general technical & installation information (PDF, hosted on our Shopify) — H&R does not publish a sway-bar-specific install guide separate from this general technical document.

Notes

• Fitment correction from the original bundled listing: the RWD H&R part 72878-5 is confirmed by Turner Motorsport, Vivid Racing, and Pelican Parts to cover 320i/328i/330i/340i (F30) and 428i/430i (F32/F33/F36) — the four-cylinder-plus-340i RWD grouping. It does NOT include the 335i or 435i/440i, which use the separate H&R part 72878-2 (see our M235i/M240i/335i/435i/440i RWD listing). The original draft's assumed model list conflated these two distinct H&R parts; this listing uses the corrected, source-verified fitment.
• RWD-only fitment. H&R sells a separate part (72878-6) for the xDrive/AWD version of these same chassis — confirm drivetrain before ordering.
• hrsprings.com's product catalog is JavaScript-only and could not be crawled directly; the part number below is confirmed against this SKU's own Shopify variant field and cross-checked against Turner Motorsport, Vivid Racing, and Pelican Parts listings for the same H&R part.

PART NUMBER

• 72878-5 — Front & Rear Set

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