If you are chasing power via high boost with the FA20 engine in your 2013-21 86 BRZ FRS, you'll need the 2.1L Low Compression Kit from HKS. With this kit, you'll get forged pistons, I-Beam connecting rods, and a forged crankshaft to match. No need to bore out your cylinders, as this kit is compatible with the stock 86mm factory size.

Main Features:

• Forged material improves durability.
• The cavity is designed in piston crown to optimize the atomization of fuel during 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.

STEP 2 Kit Features:

• Highly durable I-beam and cracked connecting rod are included. The connecting rod bolt size is optimized.
• The thickness was optimized by strength analysis. The weight increase was minimized, and the strength was increased by approximately 30%.
• I-beam shape was selected to increase the buckling strength.
• The ideal shape was realized, and the fracture origin on the surface was eliminated by forged billet manufacturing. To improve fatigue strength, strong shot peening treatment is carried out on the surface.
• The optimum heat treatment for chrome molybdenum steel was carried out to improve both strength and toughness.

Crankshaft:

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

Install Instructions:

21003-AT004

23004-AT002

23006-AT003