Genuine Rival Performance Diaphragm OE Replacement Kit – B58 PCV Fix

The BMW B58 engine is known for premature PCV diaphragm failure—often caused by the original rubber becoming brittle and cracking over time. This leads to vacuum leaks, poor performance, and fault codes.

Buy cheap, buy twice.

Our kit includes everything you need to restore proper function, including a new diaphragm cap and replacement end cap—ideal since the original is often damaged during removal.

Unlike many low-cost alternatives on the market, this is not a flimsy import or generic copy.

Our parts are built to last, developed by enthusiasts who understand what proper quality should look like under the bonnet.

✔ Designed with longevity in mind
✔ Includes end cap to prevent install issues
✔ No cheap plastic or questionable materials
✔ Backed by a UK-based performance brand