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RSE Japan
FORGED PISTON SET 4G63 86.00mm CH31.65 (2.2/2.3) CP
RSE 4G63 bore and stroke comparison. The 86.0mm configurations on the right show 2184.1cc with a 94.0mm stroke and 2323.5cc with a 100.0mm stroke. This illustration does not identify the CP piston version. Final displacement depends on the matched crankshaft and complete engine configuration.
RSE CP Forged Piston Set for Mitsubishi 4G63 – 86.0mm CH31.65 (2.2L / 2.3L)
🔧 Planning a 4G63 stroker engine build?
The RSE 4G63 86mm CP Forged Piston Set, part number RA202A-MT01AP, features A2618 aluminium alloy construction, a 31.65mm compression height and a manufacturer-listed piston crown volume of −19.6cc.
This is the CP piston version for matched 2.2L / 2.3L configurations. The pistons must be paired with the correct crankshaft stroke, connecting rods and engine dimensions. Final displacement depends on the complete engine configuration.
🚗 Listed Applications
• Engine: Mitsubishi 4G63
• Vehicles: Mitsubishi Lancer Evolution I–IX and Eclipse
Vehicle fitment alone does not confirm suitability for an existing engine build. Check the bore size, compression height and supporting components before ordering.
⚙️ Product Specifications
• Brand: RSE — Real Speed Engineering
• Manufacturer part number: RA202A-MT01AP
• Product type: Forged piston set
• Manufacturer category: Block Related / Piston
• Piston version: CP
• Listed build configuration: 2.2L / 2.3L
• Bore: 86.00mm
• Material: A2618 aluminium alloy
• Compression height: 31.65mm
• Piston crown volume: −19.6cc
• Valve reliefs: Yes
• Piston pin diameter: 22.0mm
• Piston pin length: 60.0mm
• Circlip internal diameter: 22.0mm
• Listed piston weight: 335.1g
• Listed piston pin weight: 125.0g
• Combined piston and pin weight: 460.1g
📏 Manufacturer-Listed Ring Dimensions
• Top ring: 1.20 × 2.95mm
• Second ring: 1.20 × 2.95mm
• Oil ring: 2.00 × 2.60mm
Confirm the complete supplied component list and quantities before ordering.
🛠️ Fitment & Installation
Professional engine measurement, machining and assembly are required. Your engine builder should confirm piston-to-wall clearance, ring end gaps, piston-to-valve clearance and the final compression ratio.
This product is a piston set, not a complete stroker kit. Confirm the piston quantity, supplied accessories and any additional parts required for your build.
📩 Need help with your build?
Contact KM Auto Group with your vehicle model, year, engine details and planned crankshaft and connecting rod configuration for assistance with specifications, pricing and availability.
AUD $1,538
Available on backorder
Q1. What makes RSE exhaust systems high quality?
Please note: Q1 and Q2 below relate to RSE exhaust systems. This product is a forged piston set. Please refer to the product description and specifications for details of this set.
RSE (Real Speed Engineering) exhaust systems are designed and manufactured in Japan with a strong focus on quality, performance and precision engineering.
Developed with Japanese performance engineering expertise, RSE products feature:
✅ Premium full titanium construction on selected systems
✅ Lightweight, performance-focused design
✅ Precision TIG welding and high-quality craftsmanship
✅ Optimised exhaust flow and excellent fitment
✅ Distinctive exhaust sound and improved driving experience
✅ Motorsport-inspired engineeringRSE is associated with the same Japanese manufacturing group as TOMEI USA, combining Japanese engineering expertise with performance-focused product development.
Whether you are building a street car or a dedicated track car, RSE offers an excellent balance of quality, performance and value.
Q2. Are RSE exhaust systems suitable for daily driving?
Absolutely! Many RSE exhaust systems are suitable for daily-driven performance vehicles, depending on the model, configuration and local regulations.
RSE exhaust systems are designed to offer:
✅ Improved exhaust flow
✅ Significant weight reduction
✅ Potential improvements in throttle response
✅ Aggressive exhaust sound under acceleration
✅ Lightweight titanium construction on selected modelsMany RSE exhaust systems also include a removable silencer to help reduce exhaust noise when required. However, silencer availability varies by product.
Important: Exhaust sound levels and road legality vary between models. Please check your local state or territory’s roadworthy, noise and emissions requirements before purchasing or installing an aftermarket exhaust system.
Q3. What does "Available on Backorder" mean?
If an RSE product is marked “Available on Backorder”, it means the item is not currently held in our local stock and will need to be ordered from our supplier in Japan.
Before placing your order, we strongly recommend contacting KM Auto Group to confirm:
✅ Current manufacturer availability
✅ Estimated production or restocking time
✅ Estimated shipping and delivery timeframe
✅ Vehicle compatibility and product specificationsImportant Backorder & Special Order Policy
All backorders and special orders are considered final once confirmed and placed with our supplier.
Change-of-mind cancellations, refunds or exchanges are not accepted for confirmed special orders or backorders.
Estimated delivery times are subject to manufacturer availability, production schedules, international shipping and customs clearance.
This policy does not exclude or limit any rights or remedies available under Australian Consumer Law.
Need assistance?
Contact KM Auto Group before ordering. Our team will be happy to assist with product selection, fitment, pricing and availability.
