Genuine Porsche Torx Screw Fastener 99907353502

Product Overview

The Genuine Porsche Torx Screw Fastener 99907353502 is a small part with a critical job: it is the original M8 x 21 Torx screw used as the exhaust manifold bolt on a wide range of Porsche flat-six engines. Each manifold joint depends on these screws clamping evenly against extreme heat cycling, and a manifold bolted down with stretched, corroded, or incorrect fasteners will blow its gasket, tick loudly on cold starts, and lose exhaust gas sealing. Fitting the genuine screw restores the exact thread, head profile, and material specification Porsche designed for the joint.

This screw is the current factory version, replacing the earlier 99907353501, which Porsche lists as no longer to be used in this application. Manifold applications typically use 18 of these screws per engine, so they are commonly renewed as a full set whenever a manifold is removed for gasket replacement, turbocharger work, or engine-out service. This listing is for the genuine Porsche screw, sold individually, so you can order a full set or replace only the fasteners your technician condemns.

Part Numbers & Reference Codes

OE part number: 99907353502, also written 999 073 535 02. It replaces part number 99907353501, which the factory catalogue marks as no longer to be used here and replaced by this number. The factory description is Torx screw M 8 X 21. Always order by the OE part number, check the quantity your job needs, and share your VIN with our parts team if you want us to confirm the fastener count listed for your exact model.

Vehicle Compatibility & Fitment

Verified applications as the exhaust manifold bolt include the 911 Carrera (997), the 911 Carrera (991), the Boxster and Cayman (981), and the Cayman (987), covering model years from 2009 to 2016 depending on model. The full breakdown is in the Fitment Details tab on this page. This is a standard Porsche hardware number that can appear in more than one joint across the range, so if your catalogue shows 99907353502 for a different position on your car, order by the number with confidence and let us verify it against your VIN.

Key Features & Benefits

• Exact M8 x 21 Torx specification: thread, length, and Torx head profile exactly as Porsche specifies for the manifold joint.
• Current factory number: replaces 99907353501, which is marked no longer to be used in this application.
• Heat-cycle rated material: genuine fastener material and finish specified for exhaust manifold temperatures and corrosion exposure.
• Even manifold clamping: a full set of new screws clamps the manifold evenly, protecting the gasket and preventing blow-by and ticking.
• Genuine Porsche hardware: original 999-series standard part, identical to the screw fitted on the production line.

Technical Specifications

Installation Position & Fitment Notes

In its best-known application this screw bolts the exhaust manifold to the cylinder head, with 18 screws used across both manifolds on the flat-six engines listed. Manifold fasteners live a hard life of heat cycles and corrosion, and old screws commonly stretch, seize, or snap on removal, which is why workshops renew them rather than refit them. New screws should be fitted to clean threads and tightened progressively in the factory sequence to the specified torque with a new manifold gasket, so clamping load spreads evenly as the joint heats and cools.

Product Brand, Type & Condition

Brand: Porsche. Type: Torx screw fastener, M8 x 21, from the Porsche 999 standard hardware range. Condition: brand-new genuine OEM part, supplied exactly as Porsche produces it. It is not a generic hardware-store bolt and not an aftermarket copy; thread form, head profile, and material are the factory specification.

What’s Included in the Box

This listing includes one (1) Genuine Porsche Torx Screw Fastener, OE part number 99907353502. If your job is a manifold refit, order the quantity your technician requires, typically 18 for a full manifold set on the applications listed. Manifold gaskets are separate parts and are not included; our parts team can quote the correct gaskets for your model alongside the screws.

Installation Requirements

Professional installation is recommended, particularly for exhaust manifold work, where seized original screws may need careful extraction. Threads in the cylinder head should be cleaned and inspected, new screws fitted with a new gasket, and final torque applied in the correct sequence to the Porsche specification. After the first full heat cycle, the joint should be checked for exhaust leaks, ticking noises, and correct sealing.

Warranty & Returns

This brand-new genuine part is covered against manufacturing defects, and your statutory consumer rights apply in the UAE. If the part arrives damaged or is incorrect due to our error, we will replace or refund it. Please keep the part in its original condition and packaging until fitment is confirmed, and contact us promptly if anything about the delivery does not match your order.

Confirm Fitment & Order

Ready to order? Order the Genuine Porsche Torx Screw Fastener 99907353502 from European Autospares Trading LLC, with fast delivery across the UAE. Not sure it fits your car? Contact us with your VIN and our parts team will confirm fitment before you buy. You can also browse genuine engine parts or browse genuine Porsche spare parts for related genuine parts for your vehicle.