Apr H4s Platinum Updated Version V9049 ((exclusive)) May 2026

Ensure your vehicle is connected to a or "tender," as a drop in voltage during the flashing process can cause permanent damage to the car's modules.

The original H4S (and competitors like the Nostrum Stage 2) solved the volume issue. But the platinum series promised better atomization. The problem? Early revisions had a chatter at idle on some ZF8 cars and required a very aggressive break-in procedure. apr h4s platinum updated version v9049