CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (86.5mm) - Size (+0.5mm) - Compression Ratio ( CP Pistons CPPSC7221-4
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CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (86.5mm) - Size (+0.5mm) - Compression Ratio (

CP Pistons
CPPSC7221-4
Piston Sets - Forged - 4cyl
2 Units In Stock - Ships Next Business Day
$ 885.15
$ 885.15

SKU: SC7221-4

CP Piston & Ring Set Mitsubishi 4B11 Evo X 2008-2015 Bore 86.5mm +0.5mm CR 9.2:1

This CP forged piston and ring set upgrades Mitsubishi 4B11 engines in 2008-2015 Lancer Evolution X models. Bore size of 86.5mm (+0.5mm oversize) supports larger displacement for more power while maintaining durability under boost. Includes matched rings for quick break-in and long-term sealing in street or track use.

Key Features

  • Forged 2618 Alloy: High-strength material handles extreme cylinder pressures and temperatures in turbocharged applications
  • Accumulator Groove: Controls combustion chamber pressure to resist detonation and extend engine life
  • Skirt and Dome Coatings: Reduces friction wear and promotes heat dissipation for consistent performance
  • Optimized Ring Grooves: Designed for low-tension rings to improve sealing blowby and oil control
  • Balanced Set with Rings: Precision-machined 4-piston set with premium rings arrives ready for professional installation each piston weighs 382 grams

Product Notes

  • Requires block boring and decking to 86.5mm bore by certified machine shop
  • Rings arrive pre-gapped verify and adjust final gaps during assembly
  • Ships in protective foam packaging to prevent damage

Installation Notes

  • Professional installation recommended.
  • Resize connecting rods and check rod bearings before assembly
  • Hone cylinders to match CP-spec finish for optimal ring seal

This Part Fits

Year Make Model Submodel
2008-2015 Mitsubishi Lancer Evolution GSR
2009-2015 Mitsubishi Lancer Evolution MR

Why Choose CP Pistons?

  • Proven in professional racing with multiple championships
  • Every piston CNC-machined in the USA for exact tolerances
  • Backed by extensive dyno testing for 4B11 applications

Frequently Asked Questions

  • Q: Will this fit all Evo X 4B11 engines?
    A: Yes fits 2008-2015 Lancer Evolution X GSR and MR models with stock stroke 4B11T confirm bore size before purchase
  • Q: What material are the pistons made from?
    A: Forged from 2618 T6 aluminum alloy for strength and light weight each piston weighs 382 grams
  • Q: What warranty is provided?
    A: Limited lifetime warranty against manufacturing defects when installed by qualified technician

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Secure box measures 12 x 8 x 6 inches
  • Weight: 5 lbs

Request For Information

Have questions about CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (86.5mm) - Size (+0.5mm) - Compression Ratio (? Fill out the form below and we'll get back to you by the next business day.
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