Honda Civic Si 1999-00 Si DOHC (M/T Only) WR Secret Weapon Intake

Weapon-R
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Weapon R Honda Civic Si M/T Only Intake
Part# 301-145-101
CARB EO #: D-489-3

1999-2000 Honda Civic Si L4.1595cc

The Secret Weapon Intake was designed, to increase air intake volume to the engine. The concept is to create two different air velocity profiles, one traveling at higher speeds than the other. This technology increases air volume and speed to the engine, which naturally feeds the engine 3x more air than the conventional air intake system. The intake pipe is bent out of high quality 6061 Aluminum on our Automated CNC mandrel bender. Polished to a high show quality finish. The SW1 Air filter features a tuned velocity stack to increase velocity and decrease turbulence. Only Comes In Polished.


These air intake systems use a patented dual chamber design that maximizes horsepower and torque - typically producing even more power than our own cold air systems.

On a dyno graph, the area under the power band (or power curve) represents the amount of effort that an engine is producing. The larger the overall area under the curve, the more power your engine is making. The system utilizes a dual chamber (using two different diameters and lengths of piping) that creates multiple frequency sound waves to produce a large area under the curve. These sound waves help charge the cylinders with more air and are what enables them to outperform our cold air systems.

We have found that inlet length plays a vital role in the power production of Dual Chamber systems and not all Dual Chamber induction systems relocate the filter outside of the engine compartment. In these cases, we performed extensive temperature testing to locate the filter in the coolest area of the engine compartment to achieve the lowest inlet temperatures possible. Please refer to our temperature testing procedures for more information.

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