IRP forged pistons, PORSCHE 991.1 T (S) / 991.2 T (S) (3.8L MDA/MDB/MA)

Italian RP (IRP) Forged Piston Kit

Forged pistons made from the highest quality alloys with extremely precise tolerances.
Designed to withstand heavy loads such as Stage 3 and Stage 4 builds and demanding motorsport use.
Available in multiple bore sizes and compression ratios.
Our selection also includes IRP piston + rod packages or rods separately according to your needs.

We also offer fully custom-dimension IRP pistons and rods – contact us for more details.

What’s included

• Forged piston set including pins, locks, and piston rings
• High-strength piston pins
• Reinforced pin locks
• High-quality piston rings for demanding use
• Piston materials and coatings according to selected package level

Kit levels

Choose the specification that fits your build:

• Silver – Most popular choice, excellent performance for tuned street and track cars
• Gold – Higher-grade materials and tighter tolerances for higher power goals
• Platinum – Top-tier package for extreme power, durability, and full racing use

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Specifications

Compatible models	PORSCHE 991.1 T (S) / 991.2 T (S) (3.8LTR. FLAT-6)
Engine type	MA1.71/MDA.B MDA.BA/MDB.C MDB.CA/MDB.CB 3800cc
Stroke length	OEM mm
Pin diameter	23.000 mm
Designed for rod length	138.000 mm

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IRP Forged Pistons

• High-strength forged alloy, resistant to detonation and heat
• Optimized crown and skirt geometry for controlled expansion and reduced friction
• Multiple compression ratios and oversizes for different turbo and fuel applications
• High-quality piston rings and heavy-duty pins included

Fitment & ordering

Parts are model- and engine-specific. Select bore size and compression ratio from the product menu.
If you are unsure about fitment, contact us via WhatsApp, email, or the contact form – our experts will be happy to assist you!

Additional information & links

• IRP main catalog (PDF)
• Installation instructions, pistons

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