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712, 2017

BMW N54 vs. N55 Comparison: Horsepower, Reliability, and Tune-ability

By |December 7th, 2017|Categories: General|6 Comments

BMW N54 vs. N55: The Key Differences You Need to Know to make an Informed Decision Before purchasing a turbocharged 135i, 335i or 535i it is important to consider the differences between the N54 and N55 powered BMW’s. The N54 began production in 2006 and first appeared in the 2007 BMW 335i; in 2008, the N54 was introduced along with the 135i and 535i. BMW’s N55 engine began production in 2009 and started replacing the N54 in 2010. However, most [...]

412, 2017

Diagnosing a Failing BMW Vanos System – When to Repair Your Vanos

By |December 4th, 2017|Categories: N54 Maintenance|9 Comments

When to Replace or Rebuild your BMW VANOS System This guide brought to you by BMW N54 Tuners will explain what the VANOS system is, the importance of the technology, and most importantly when and why it should be replaced or rebuilt. The VANOS system isn't unique to the N54 engine; it is used in many variations of BMW engines. However, for tuning purposes it is important to at least be able to identify VANOS problems, and know how to [...]

2011, 2017

BMW N54 Downpipes: Catless vs. Catted High-Flow Downpipes

By |November 20th, 2017|Categories: N54 Tuning Guides|3 Comments

N54 Catless vs. Catted Downpipes Why Upgrade my N54 Downpipes? One of the biggest restrictions on the N54 powered 135i, 335i and 535i is the factory catted downpipes. Downpipes bolt directly to the turbochargers and the factory catalytic converters create significant back-pressure which results in slower turbo spool. Modifying your N54 with catless or high-flow catted downpipes results in faster spool, tremendous power gains, and an aggressive exhaust note. Upgraded downpipes are a great modification especially for N54's that have [...]