Thread: K&n 2004 325i
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Old 01-11-2013, 07:10 PM   #6
jabela
3rd Gear Member
 
Join Date: Apr 2007
Location: Toronto, ON, Canada
Posts: 393
Car: 2002 BMW 325ci
The heat shield is important because it keeps the hot engine air away from your intake. Without it you will lose horsepower and get lower mpg.
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2002 E46 325ci // 5spd // Sport Suspension
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