zoom2zoom

iTrader: (5)

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.

paul

iTrader: (21)

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?

zoom2zoom

iTrader: (5)

If I use a 3in cat the rest of the exhaust would be 2.5in.

Laur3ns

Metal above ceramic. Get a 2.75 or 3" metal core.

zoom2zoom

iTrader: (5)

but metal core are more than twice the cost.

Laur3ns

If cost is a concern and if for ceramic, why not stick to what you've got?

zoom2zoom

iTrader: (5)

because I don't have one yet!! putting my exhaust together this weekend.

skidude

iTrader: (3)

I think spooky means stick with the stock cat.

paul

iTrader: (21)

Wait another week and go with the 3" metalcore. Do things right the first time. That's the cheapest way.

TurboTim

iTrader: (9)

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.

Atlanta93LE

iTrader: (5)

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.

m2cupcar

iTrader: (5)

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?

Braineack

iTrader: (62)

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.

paul

iTrader: (21)

All the (tree hugging)cool kids are using the 3" spun metal core

zoom2zoom

iTrader: (5)

I have a second chance offer on a Random Technologies 3in for $60 shipped, they retail for around $220 and are rated for 570cfm.

y8s

iTrader: (8)

are the cores even different sizes on the 2.5 and 3" ceramics? cuz I dont think so.

zoom2zoom

iTrader: (5)

Are you saying the cores are the same size just with different size inlet and outlet?

Joe Perez

iTrader: (8)

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.