Wiseco K699M865 Piston Kit 86.50mm Bore 10.5:1 Compression 4B11 EVO X

The Wiseco K699M865 is a high-performance forged piston kit engineered for 2008+ Mitsubishi 4B11 EVO X engines. This complete piston set features an 86.50mm bore with 0.02 oversize, 86mm stroke, 3.5cc dome volume, and a 10.5:1 compression ratio designed to optimize power output and reliability in turbocharged applications.

Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy that delivers superior strength, reduced weight, improved heat transfer, and extended service life compared to cast pistons. The forging process compresses the material's molecules, increasing aluminum density and aligning grain flow for exceptional resistance to impact and fatigue. Each piston features a diamond-turned finish from CNC-controlled machining centers, guaranteeing a perfect surface with zero size variation.

This complete piston kit includes precision-engineered Wiseco forged pistons, piston rings, wrist pins, and circlips—everything needed for a professional engine rebuild or performance upgrade. Engineered, forged, and machined in Wiseco's state-of-the-art facility in Mentor, Ohio, each piston is optimized specifically for the 4B11 platform to deliver maximum durability and performance under demanding boost conditions.