Ordered a K & N Typhoon Air Intake System today for the M3 from ebay. The cost was US$329 including shipping by international express mail. This is still cheaper than buying it locally in Japan, which costs JPY51,000 ($450), a saving of $120!
The K & N is a high performance air intake (filter) system which increases airflow to the engine and consequently horsepower. The product is backed by a million mile warranty and is supported by actual dyno data for each car. The M3 (E46) was tested and gained 8.9hp at the wheels ! This translate to over 10hp at the crank...the chart shows the power gain is consistent throughout a broad range of engine speed.
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