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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 03-23-2006, 03:37 PM   #1
dinan540
 
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Hi Flow Cats
What do you guys know about them? Any experience with them? Any HP gain? Do they lighten weight?
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Old 03-23-2006, 11:11 PM   #2
cainchapman
 
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Location: Auckland, New Zealand
Rate My Car: 126 / 340
Your Ride: 1995 540LE
BMW have done a great job on designing the Cat in the 540's. I have removed mine and have not noticed an increase in power. I have not dyno'd it since however. It just sounds a little sweeter.

More gains are to be had in the rear muffler.
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Old 03-24-2006, 10:59 AM   #3
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I have a Remus muffler currently.
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Old 03-25-2006, 03:44 AM   #4
cainchapman
 
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By all accounts, you can't do much better than that as an "off the shelf" muffler.
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