Regular price $3,420.00 USD Sale price $3,420.00 USD Regular price $3,800.00 USD
Sale 10.0% $380.00 USD (10.0%)
Special order - Ships in 5+ weeks
SKU: hks21004-AT003
Product Description

High boost tuning in the era of direct injection engines! The low compression type FA20 2.1L Kit is available for high boost tuning. Upgrading with forced induction is very common for the FA20 engine tuning. HKS has developed a highly durable low compression piston required to move onto the next tuning level.


  • Capacity: 2091, Type: D86.0-22, Boring/Honing modification: Not required, Full flow modification: Not required, FORGED PISTON KIT + I-BEAM CON'ROD + FORGED CRANKSHAFT, Box#2: 440x360x225(Crank) 13kg


  • SUBARU BRZ [FA20] (2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021)


POINT-1 Piston

  • Forged material improves durability.
  • The cavity is designed in a piston crown to optimize the atomization of fuel during the injection.
  • 3D Piston crown design to optimize tumble flow.
  • The piston is recessed to match high lift HKS camshafts.
  • The compression ratio range is widened depending on the gasket's specification.
  • Molybdenum coated pistons reduce friction

POINT-2 Connecting Rods

  • A cracked connecting rod is chosen for the long stroke. The big end size is designed to omit modification of the engine block.
    (Nissan genuine bearing for RB26 and SR is required separately)
  • Highly durable I-beam and cracked connecting rod are included. The connecting rod bolt size is optimized

POINT-3 Crankshaft Stroke 90.0mm

  • The crankshaft is made from forged materials.
  • Bespoke pin journal size is employed



To provide faster delivery and turn around time; Kami Speed ships products out from different warehouses throughout the United States. Usually averaging 1-4 business days for processing prior to shipping.

Depending on the package, we ship using different carriers according to the item's location, content, and size.

Freight truck & international items, will require up to 7 business days to ship due to size and logistics.

All orders made after 3:00pm ET will be shipped or processed the next business day.

Unless otherwise noted as "In Stock" or exact ETA. Special Order items have an ETA of 5+ weeks.

Orders over $500 will ship insured and over $1,000 with signature and insurance in order to guarantee delivery. Orders over $1000 may not be able to ship to a different address not listed as the billing address or confirm payment address from the form of payment used. Orders with suite numbers, different billing, or apartment numbers will require signature if valued over $100.

All international orders outside of the USA are subject to duties and taxes fees per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.

Processing and logistics on in stock international orders can take up to 7 business days to process & ship.

In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail. All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).

Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.

For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.

WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

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