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Old 09-19-2008, 01:43 AM   #1
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Default converter comparison/opinions?

Should I go with a 3in ceramic or 2.5in spun metallic cat? Which would flow better? I'm trying to stay within a budget.
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Old 09-19-2008, 02:12 AM   #2
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Would the rest of the exhaust be the same size? as in you'd do a full 3" exhaust if you went with the 3" ceramic or a full 2.5" exhaust if you went with the 2.5 metalcore?
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Old 09-19-2008, 02:39 AM   #3
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If I use a 3in cat the rest of the exhaust would be 2.5in.
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Old 09-19-2008, 03:42 AM   #4
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Metal above ceramic. Get a 2.75 or 3" metal core.
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Old 09-19-2008, 03:46 AM   #5
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but metal core are more than twice the cost.
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Old 09-19-2008, 04:49 AM   #6
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If cost is a concern and if for ceramic, why not stick to what you've got?
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Old 09-19-2008, 06:39 AM   #7
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Quote:
Originally Posted by Spookyfish View Post
If cost is a concern and if for ceramic, why not stick to what you've got?
because I don't have one yet!! putting my exhaust together this weekend.
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Old 09-19-2008, 08:19 AM   #8
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Quote:
Originally Posted by zoom2zoom View Post
because I don't have one yet!! putting my exhaust together this weekend.
I think spooky means stick with the stock cat.
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Old 09-19-2008, 08:37 AM   #9
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Wait another week and go with the 3" metalcore. Do things right the first time. That's the cheapest way.
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Old 09-19-2008, 08:44 AM   #10
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I of course agree with Paul, but I'm pretty sure the magnaflow 2.5" and 3" spun metal core cats use the same sized core.
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Old 09-19-2008, 09:28 AM   #11
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Avoid the cheap ceramic "Magnaflow/Catco" cats. They'll get you through the visual inspection, but good luck with a sniffer test after the first ~year.
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Old 09-19-2008, 09:31 AM   #12
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The metal core is going to get you proper emissions AND better flow. In the scope of the project is another $40-50 really that much dough?
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Old 09-19-2008, 10:04 AM   #13
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Magnaflow Part# 53009 Catalytic Converter-Universal
3" In/Out No Air
$65.51

Magnaflow Part# 54959 Universal Spun Ceramic Catalytic Converter
3" C/C
$85.62

Magnaflow Part# 59959 Universal Spun Metal Core Catalytic Converter
3" In/out Center / Center
$102.76

Just do it.....thats a $40 difference over the standard lame cat, only $17 over the spun ceramic.
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Old 09-19-2008, 03:46 PM   #14
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All the (tree hugging)cool kids are using the 3" spun metal core
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Old 09-19-2008, 03:49 PM   #15
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I have a second chance offer on a Random Technologies 3in for $60 shipped, they retail for around $220 and are rated for 570cfm.
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Old 09-19-2008, 04:57 PM   #16
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are the cores even different sizes on the 2.5 and 3" ceramics? cuz I dont think so.
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Old 09-19-2008, 05:52 PM   #17
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Quote:
Originally Posted by y8s View Post
are the cores even different sizes on the 2.5 and 3" ceramics? cuz I dont think so.
Are you saying the cores are the same size just with different size inlet and outlet?
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Old 09-19-2008, 06:08 PM   #18
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Quote:
Originally Posted by zoom2zoom View Post
Are you saying the cores are the same size just with different size inlet and outlet?
This is quite common, actually. It's much simpler for the manufacturer to only produce a few different cores, and use those as the basis for a large number of different packages.

The key point here is that the rest of the system is going to be 2.5". That fact alone dictates that the cat should have 2.5" I/O as well, regardless of what material the core is made of.
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