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Engines and Components› Pistons and Piston Rings
HKS
HKS PISTON FULL KIT FA24 2.5L HIGH COMP STEP1
SKU: H005 21004-AT008
Advanced — 4+ hours
Overview
The kit includes a forged piston kit, an I-beam connecting rod, and a forged crankshaft. The pistons are made from A2618 material for high-temperature strength and feature a 2-layer molybdenum coating to reduce friction. The piston head cavity optimizes fuel atomization for direct injection, while the 3D crown shape sustains tumble flow and allows for high-lift camshaft use.
Show original supplier description
Part #: 21004-AT008
Vehicle Symptoms
- Engine knock under boost at high RPM
- Loss of power during acceleration
- Piston slap noise on cold start
- Engine not holding boost pressure
- Preventive upgrade before supercharger install
Relevant Conversations
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- HKS FA24 piston kit installation time
- FA24 engine knock after supercharger install fix
- FA24 forged crankshaft HKS 2.5L stroker
- HKS vs CP pistons for FA24 reliability
- FA24 piston kit install guide forum
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | HKS |
| Part Number | H005 21004-AT008 |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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