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

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 Reviews There are no reviews yet. Be the first to review “CP Piston & Ring Set for Mitsubishi 4B11 Evo X – Bore (86.5mm) – Size ( 0.5mm) – Compression Ratio (” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.