ARP Main Stud Kit - Audi 5-Cylinder (4000/5000/80/90/100/200/Coupe/Quattro)

ARP main stud kit for the Audi inline-five, replacing the factory main cap bolts with heat-treated studs for consistent clamping load and improved bottom-end strength under boost or high RPM. Studs thread into the block and torque against ARP nuts, giving a more accurate and repeatable clamp than stretch bolts. Kit includes the main studs, nuts, washers, and ARP Ultra-Torque assembly lube.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy