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  1. K&N or PiperX

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Which panel filter do you rate or recomend for my 320d (150bhp)
  2. e46 320ci - Piperx Velocity Intake System

    BMW Tuning Forum
    Can someone expand on my thoughts of either installing a Pipercross Velocity Intake System or a Viper Kit over one of their standard swap panel filters. Would I really see the benefit in low/mid rev pick up and cold the increase airflow play havok with the engine management. I'm looking into a...