TGK Motorsport Rear Endlink Control Arm Conversion - B9 A4/S4/RS4/A5/S5/RS5/Q5/SQ5
TGK Motorsport Rear Endlink Control Arm Conversion - B9 A4/S4/RS4/A5/S5/RS5/Q5/SQ5
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PREORDER
PREORDER ETA: Early / Middle of August
This Product is currently available as a preorder!
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Overview
The factory rear endlink on the 2017–2026 Audi B9 A4, S4, RS4, A5, S5, and RS5 connects the sway bar to the suspension through a rubber-bushed mounting point. That rubber is intentional from the factory — it absorbs road noise, reduces NVH, and keeps the car compliant for daily comfort. But it comes at a direct cost to chassis performance. When the sway bar loads up under cornering, that rubber deflects instead of transmitting force immediately, effectively softening your sway bar's spring rate before it even has the chance to do its job. The result is increased body roll, delayed chassis response, and a sway bar that never reaches its full anti-roll potential — whether you're on a 2.0T A4, a 2.9T S5, or a full-send RS4 on track.
The TGK Motorsport Rear Endlink Control Arm Conversion eliminates that compliance entirely by replacing the OEM rubber endlink mount with a solid, precision-engineered connection point built from aerospace-grade 6061 aluminum, a high-load spherical bearing, and a polyurethane bushing. The result is a direct, rigid load path between the sway bar and the suspension — every degree of chassis roll is met with the full spring rate of your sway bar, instantly. No cushion, no lag, no energy lost in flex. This is the upgrade that makes your existing sway bar — or any aftermarket bar — actually perform as designed.
VIDEO OF STOCK CONTROL ARM DEFLECTION
Specifications
| Part number | TGK-0405-01 |
| Compatible vehicles | Audi A4, S4, RS4, A5, S5, RS5 | B9 Platform | |
| Material | 6061 Aluminum control arm, Spherical bearing, Polyurethane bushing |
| Hardware included | Yes |
| Warranty | Lifetime structural warranty |
Features & Benefits
✓
Solid Mount ConnectionReplaces the OEM rubber endlink pivot with a rigid, zero-deflection connection point that delivers full sway bar spring rate the moment the chassis loads under cornering.
✓
Spherical Bearing PrecisionA high-load spherical bearing handles articulation demands at the joint without introducing compliance, maintaining a true, direct load path through the full range of suspension travel.
✓
6061 Aluminum ConstructionThe control arm itself is machined from 6061 aluminum — lightweight, corrosion-resistant, and engineered to outlast the OEM rubber-mounted assembly across tens of thousands of miles and repeated track cycles.
✓
Polyurethane Bushing IncludedA polyurethane bushing handles the chassis-side interface, dramatically more durable and dimensionally stable than rubber while still providing just enough compliance to remain streetable on your B9 Audi daily driver.
✓
Maximize Any Sway BarWhether you're running OEM or an upgraded aftermarket sway bar on your A4, S4, RS4, A5, S5, or RS5, this conversion ensures you're using 100% of the bar's rated anti-roll spring rate — not a fraction of it.
✓
Complete Hardware KitAll necessary mounting hardware is included. No sourcing additional fasteners — the kit installs with standard hand tools and is designed for a direct, no-modification fit on B9 platform Audis from 2017 through 2026.
Frequently Asked Questions
Why does the factory rubber endlink mount hurt performance on my B9 Audi?
The OEM rubber endlink mount is designed for ride comfort and NVH reduction — not chassis stiffness. Under cornering load, the rubber deflects before transmitting force to the sway bar, which effectively lowers the bar's spring rate. On a 2017–2026 Audi A4, S4, RS4, A5, S5, or RS5, this means increased body roll and a chassis that responds more slowly than your sway bar is actually capable of. Replacing it with a solid-mounted spherical bearing and polyurethane bushing eliminates that energy loss entirely.
Will this make my B9 Audi too harsh for street driving?
No. The TGK Rear Endlink Control Arm Conversion uses a polyurethane bushing at the chassis interface rather than a fully solid mount. This retains enough compliance to remain comfortable on the street while still delivering a dramatically more direct sway bar connection than rubber. The difference you'll feel is sharper turn-in and reduced body roll — not a jarring ride.
Do I need an aftermarket sway bar for this to be worth it?
No — this conversion improves performance regardless of which sway bar you're running. Even the factory sway bar on the B9 A4, S4, A5, or S5 is being underutilized due to rubber endlink compliance. That said, if you are running or planning to install an aftermarket sway bar, this conversion is essential to ensure you're realizing the full rated spring rate of that bar. Think of it as unlocking performance you've already paid for.
What warranty does the TGK Rear Endlink Control Arm Conversion carry?
Every TGK Motorsport Rear Endlink Control Arm Conversion is backed by a lifetime structural warranty. We engineer our components from 6061 aluminum and high-load spherical bearings specifically because we stand behind them for the life of your build — whether that's daily street driving, weekend autocross, or repeated track days on your RS4, RS5, S4, or S5.
