RPM High-Boost Forged Piston Kit (BMW B48)

RPM Tuning Forged 4032 Pistons – B48 Engine

Unlock the full potential of your B48 build with RPM Tuning’s 4032 Forged Pistons – precision-engineered for high-boost performance, superior durability, and exacting reliability. Designed for enthusiasts pushing serious power, these pistons are the ideal choice for turbocharged street builds, track machines, or motorsport-grade engines.

✅ Why Choose RPM Tuning Forged Pistons for Your B48?

Crafted from 4032 aerospace-grade aluminum alloy, these pistons offer excellent thermal stability, reduced expansion, and enhanced resistance to detonation. Lighter than 2618 alternatives but still extremely strong, 4032 is perfect for reliable, long-term street or track use without compromising on performance or safety.

Every piston is CNC-machined, balanced, and coated for optimal performance under extreme conditions. Whether you're chasing lap times or power figures, these pistons are built to keep up.

⚙️ Product Features

🛠 4032 Forged Aluminum Alloy (Big Power Builds)

• Heat resistant with lower thermal expansion characteristics

• Excellent wear resistance under high loads

• Ideal for both street and motorsport applications

🔧 Precision CNC Machining

• Machined to exact tolerances for perfect fitment

• Balanced for consistent combustion and smooth operation

• Supports high-RPM stability and high compression builds

🛡 Coated Skirts & Valve Reliefs

• Skirt coatings reduce friction and piston slap

• Valve reliefs optimized for aftermarket cam profiles or higher lift

• Compatible with oversized valves and ported heads

🎯 Engineered for High Boost

• Handles aggressive tuning and high cylinder pressures

• Designed for turbocharged and performance B48 builds

• Supports compression ratios for pump fuel, race fuel or E85 setups

📏 Balanced & Matched Sets

• Each piston is weight-matched within ±1.5g tolerance

• Ensures balanced reciprocating mass and smooth engine dynamics

• Improves longevity of engine bearings and rotating assembly

🔩 Pin Included (Optional HD Wrist Pin Upgrade Available)

• Comes with precision wrist pins as standard

• Upgrade to heavy-duty wrist pins for extreme power builds

📊 Technical Specs Summary:

🧩 Compatible With BMW B48 Engines in:

1' F21 LCI   (10/2015 — 06/2019)
1' F52 Sedan   (11/2015 — 08/2019)
2' F22   (09/2015 — 06/2017)
2' F22 LCI   (09/2016 — 06/2021)
2' F23   (09/2015 — 06/2017)
2' F23 LCI   (10/2016 — 07/2021)
2' F45 Active Tourer   (03/2014 — 03/2018)
2' F45 Active Tourer LCI   (06/2017 — 12/2018)
2' F46 Gran Tourer   (07/2014 — 03/2018)
3' F30 LCI   (09/2014 — 03/2019)
3' G20 Sedan   (01/2018 — 06/2022)
3' G20 Sedan LCI   (09/2021 — 03/2025)
3' F35 LCI   (07/2015 — 03/2019)
3' F31 LCI   (09/2014 — 06/2019)
3' F34 GT LCI   (09/2015 — 05/2021)
4' F32   (05/2015 — 02/2017)
4' F32 LCI   (05/2016 — 06/2020)
4' G22 Coupé   (11/2019 — 01/2024)
4' G22 Coupé LCI   (03/2023 — 03/2025)
4' F33   (03/2015 — 02/2017)
4' F33 LCI   (05/2016 — 07/2020)
4' F36 Gran Coupé   (03/2015 — 03/2017)
4' F36 Gran Coupé LCI   (06/2016 — 05/2021)
4' G26 Gran Coupé   (12/2020 — 04/2024)
4' G26 Gran Coupé LCI   (06/2024 — 03/2025)
5' G30   (09/2016 — 06/2020)
5' G30 LCI   (07/2019 — 06/2023)
5' G38   (10/2016 — 08/2020)
5' G31 Touring   (09/2016 — 06/2019)
X1 F48   (11/2014 — 03/2018)
X1L F49   (12/2014 — 08/2019)
X3 G01   (12/2016 — 08/2021)
X3 G01 LCI   (09/2020 — 06/2024)
X3 G08   (01/2017 — 12/2020)
X4 G02   (04/2017 — 07/2019)
MINI F56   (04/2013 — 07/2019)
MINI F55   (09/2013 — 06/2019)
MINI Clubman F54   (11/2014 — 07/2019)
MINI Cabrio F57   (11/2014 — 06/2019)
MINI Countryman F60   (11/2015 — 06/2019)

💡 Please confirm piston compression height and piston crown clearance for 20i & 30i, and also inquire to confirm Gen 1 vs Gen 2 B48 variants prior to assembly.

🔥 Ideal Pairing:

Pair with RPM Tuning Forged 4340 H-Beam Rods, ARP 2000 bolts, upgraded bearings, and MLS head gasket for a complete forged bottom-end setup.