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400" is the factory length used in standard LS1
Upgrade your original E90 or E93 ECM by sending it to HP Tuners
Each system is paired with a washable
which can potentially increase horsepower and acceleration
Proper data is required for proper tuning
RG-1002RD K&N Universal Clamp-On Air Filter UPGRADE 400" is the factory lengthK&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra strong molded pliable rubber flanges which absorb vibration and allow for secure
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