The Injen Technology intake system is a high-performance, dyno-proven system made of CNC mandrel bent 6061 T-6 aluminum alloy. The 300ZX intake is carefully engineered for a perfect fit and superior performance. Many other intakes in the market are made of 3.00" diameter tubes. This may cause friction between the battery and the intake system, dented hoods and an unbalanced air fuel ratio which can be harmful to your engine. Injen Technology has taken extra measures to ensure that the consumer gets what they paid for: optimum throttle response. We polish every intake for those who are conscious of aesthetics along with horsepower gain. With the use of 1/4" thick 6061 T-6 aluminum and precise CNC machined brackets and adapters. Injen Intaks come with a limited lifetime warranty to ensure a quality intake for years to come.