Porsche considers the timing chains be a lifetime item, that doesn't need to be replaced. However, enthusiasts tend to know a little better. Porsche owners know that if the chains are not maintained and timing service done, headaches can be expected in the future.
With no service interval to go by, you need to pay attention to the chains. The first symptom is noise in the timing system. The chains slap around because of worn tensioners and guides. The common sound is “marbles in a can.” Failed guides can cause the chains to jump, skip a tooth and potentially snap. A snapped chain or one that has jumped a tooth means that valves can contact the pistons and cause catastrophic engine failure.
The experts at Euromotiv have assembled a kit for you to take care of this common problem.
This kit includes:

Left timing chain
Right timing chain and tensioner
Right lower guide rail
Right Valve Cover Gasket
Left lower guide rail
Left timing chain tensioner
Left upper guide rail
Left Valve Cover Gasket
Timing cover Bolts
Timing cover gasket fluid
Both upper guide rails
Oil pump drive chain
Oil pump chain tensioner
Lower oil pump chain guide rail
All securing hardware.

Cross Reference

95810516900
958109465C
95810505100
95810505101
PAC109218A
958109465D
95810546520
95810546510
958109465B
95810521700
PAC109217B

Porsche V6 Hybrid Ultimate Timing Chain Kit