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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 10-15-2007, 10:15 AM   #1 (permalink)
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oem cats vs. free flow cats

Does anyone know how much of a difference in performance there is between oem cat converter vs. high flow cat converter? I'm thinking about replacing mine sometime soon cause there's some rattling happening down there.
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Old 10-15-2007, 10:43 AM   #2 (permalink)
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Depends on the price difference, seems the oem cat is not that restrictive.
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Old 10-15-2007, 03:24 PM   #3 (permalink)
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For FI applications, it can make a real difference. My ATL mechanic changed out his E38 cats on a motor already producing 725 bhp and that mod with Dinan M5 exhausts added almost 75 bhp.
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Old 10-16-2007, 06:53 PM   #4 (permalink)
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I don't think there will be any HP gain from the freeflow cats.
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Old 10-17-2007, 07:06 AM   #5 (permalink)
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For FI applications, it can make a real difference. My ATL mechanic changed out his E38 cats on a motor already producing 725 bhp and that mod with Dinan M5 exhausts added almost 75 bhp.
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Old 10-24-2007, 06:36 PM   #6 (permalink)
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there are so many levels of high flow cats. it depends on the cell count in them. however price wise they are far cheaper than OEM cats and some perform nearly as good given the proper matching.
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