Product Description
1999-2004 Mustang Cobra IRS Billet Knuckle Kit by Synergy Race Development
The weak, failure-prone factory cast knuckles are officially obsolete. With the help of Pernstar Motorsports, Synergy’s Billet IRS Knuckles are the first of their kind — precision-engineered to replace and vastly outperform the OEM Cobra IRS units. Designed for serious performance and total adjustability, these knuckles deliver the strength and control the platform always needed.
The world’s first billet IRS knuckle for the ’99–’04 Cobra — stronger, smarter, and fully adjustable.
Key Features:
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Billet Construction: CNC-machined from aerospace-grade billet aluminum and stainless steel for unmatched strength, precision, and reliability. No more cracked castings.
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Reversible Bearing Block: Instantly switch between OEM ride height or a 30mm ride height drop — just flip the bearing block. No additional parts required.
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Camber Control: Run OEM camber gain or reduce it by 45% for improved tire contact under compression with the flip of a block.
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Static Camber Adjustment: Built-in fine-tuning for static camber — no shims, no hacks.
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Adjustable Toe Gain: Dial in toe characteristics to match your setup and driving style, from street grip to full competition.
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Dual Caliper Ready: Integrated brackets support OEM or Z32 secondary calipers, ideal for hydraulic handbrake configurations. Modular brackets mean your brakes can grow as you do without the need of buying new knuckles! Popular brake options are available with the possibility of more to come!
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OEM Direct Fit: 100% bolt-on replacement for factory Cobra IRS knuckles — retains OEM hubs, axles, and brake fitment. OEM, Amazon and 1000hp Driveshaft Shop Axles have been verified!
- Serviceability: Removable Wheel Bearing block, without the need of an alignment after! You can leave the knuckle bolted to the car with alignment set and remove just the wheel bearing block and change wheel bearing without worry of alignment! Spare parts will be available and fully rebuildable!
- Made in the USA: There's nothing better than high quality, American made parts for your American car!
Engineered for strength. Designed for adjustability. Proven for performance.
These aren’t just replacements — they’re a complete geometry upgrade for the IRS Cobra.
For Track use only, NOT DOT APPROVED.
