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Old 11-30-2002, 10:37 AM   #1
Kazushi
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Default cobb headers

I know Cobb has a header/cat combo under works. Does anyone think they'll be significantly better than anything out there and worth the wait?

Right now I have a Cobb/PRM intake, Cobb street cams, and a Brullen catback. I need headers to round it out, and i've been liking Cobb stuff so far.

PS. Would adding headers to my current setup (without a high flow cat) be pointless? Or should i get both?

thanks!
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Old 11-30-2002, 02:32 PM   #2
rhdude
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The stock cat flows more air than the Random Tech cat, Trey Cobb told me...
He said thats why they are making their own cat, so that there is a cat on the market that flows more than stock....

Buy the headers, and if you have the money get the cat... a full free flowing exhaust is better than one with a single stock piece(in most cases)..

~Brian
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Old 11-30-2002, 09:33 PM   #3
SubaruRallySport
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Kazushi
Do you like the cams from cobb? I am thinking about getting them. Let me know
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Old 12-01-2002, 11:03 AM   #4
Kazushi
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The cams are good and make a difference you can feel. I've had no CEL (not many people do with the street cams), and idle quality is unaffected in my opinion. They are expensive however, and doubly so for the labour.

This in my opinion is the only performance mod i have on my car, the intake and catback merely help the cams breathe better. I'd guesstimate i'm around 185 hp at the flywheel with my current stuff.

So replacing the headers (with borlas maybe) and leaving the stock cat will get me more gains?
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Old 12-01-2002, 12:27 PM   #5
awdwagon
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Quote:
Originally posted by rhdude
The stock cat flows more air than the Random Tech cat, Trey Cobb told me...
so your saying by replaceing 2 stock cats(factory subaru) with 1 high flow cat(random tech) wont get you any gains?

i know you got your info from trey, and i know they make good pruducts, but does he have dyno numbers to prove this? id be very interested in seeing them.
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Old 12-01-2002, 12:34 PM   #6
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don't know about dyno numbers...
BUT.... he explained the stock cats flow just as well as any other part of the exhaust piping, the thing that makes the random tech bad, is the piping... he said there is a weird near-90 bend that really hurts flow. Most people think its the same with the stock cats, but at my turbo install we ripped my cat section apart, and its actually a pretty good design, more easily flowing than the random tech.

~Brian
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Old 12-01-2002, 12:43 PM   #7
awdwagon
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random uses a 2.25 mandrell bent pipe, thats as smooth as a flow your gonna get, it follows the same route as a stock cat set up on a subaru. maybe its me, but i cant see how going through one cat and through a non-mandrell bent 2' elbow and through another cat is more free flowing.
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Old 12-01-2002, 12:49 PM   #8
Peaty
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Quote:
Originally posted by awdwagon
random uses a 2.25 mandrell bent pipe, thats as smooth as a flow your gonna get, it follows the same route as a stock cat set up on a subaru. maybe its me, but i cant see how going through one cat and through a non-mandrell bent 2' elbow and through another cat is more free flowing.
I tend to agree, plus I felt a noticable difference with the Random Tec cat (which I purchaced from Cobb that claimed an increase with the cat)

I mean look at them side by side and tell me they have the same flow...

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Old 12-01-2002, 01:25 PM   #9
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ok, I have'nt felt the random tech, so I'm just going on what I heard...

I was told that bend on the left side of the RT is what limits flow.. the stock cat in that location is more open or less of a bend?....

and yes I almost bought one, but I replaced my cat section with one that gives me alot more HP than the RT could ever give
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Old 12-01-2002, 06:16 PM   #10
Albert
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Quote:
Originally posted by rhdude
...but I replaced my cat section with one that gives me alot more HP than the RT could ever give
I assume custom made using an universal cat... what brand, size piping??
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Old 12-01-2002, 06:28 PM   #11
Peaty
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I was assuming he got rid of the cat alltogether.
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Old 12-01-2002, 06:57 PM   #12
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3" up pipe, Garret T3/4, 3" downpipe...
don't people ever read the sidebar locations anymore? j/k...

~Brian
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Old 12-01-2002, 07:59 PM   #13
Albert
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Quote:
Originally posted by rhdude
... but I replaced my cat section with one that gives me alot more HP than the RT could ever give
Sorry, Man I must be getting old! You guys must write and read a language I don't understand ...neither the quote nor your sidebar makes any reference or inference that you are catless. Again, sorry
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Old 12-01-2002, 08:38 PM   #14
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Sorry I geuss I got ignorant and assumed that all RS owner's know that when you go turbo, you loose your cat section... again, sorry about that...

~Brian



P.S. Are the Cobb headers going to be equal length? What size piping?
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Old 12-02-2002, 01:34 PM   #15
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anyone know if the cobb cat is a direct OEM replacement, or can it only be used with trey's headers/midpipe?

aren't the headers and cats already out? or just pictured on the site?
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Old 12-02-2002, 02:20 PM   #16
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The ones you see now on Cobb's site are the Borla's, not cobb's
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Old 12-02-2002, 05:33 PM   #17
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Quote:
Originally posted by rhdude
The ones you see now on Cobb's site are the Borla's, not cobb's
thought they looked kinda similar...as in the angle that the photgraph was taken at and everything...

well then that answers my question as to whether it bolts in.
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Old 12-02-2002, 10:23 PM   #18
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fyi...that is the old random cat design..they have sinced switched to all metal(no ceramic) reducing weight and making it a truly free flowing cat...there is absolutely way the stock cat will outflow their new design...
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Old 12-03-2002, 01:11 AM   #19
mrbillydee
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I don't have one, but it looks like to me it's a flex bend?
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Old 12-03-2002, 01:12 AM   #20
GTBGUY
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Question is it just me or....

Looks like that last bend before hooking up to the mid-pipe isn't mandrel bent... looks like some crush bending or something
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Old 12-03-2002, 04:10 AM   #21
six6sicks
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Well I just got my Random Tech. Cat. today and it looks a lot better than that picture up there. I'll take a picture tomorrow then I'll try and figure out how to get it on here.
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Old 12-03-2002, 06:22 PM   #22
six6sicks
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How do I show picture on this thing?

Last edited by six6sicks; 12-03-2002 at 06:39 PM.
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Old 12-03-2002, 10:38 PM   #23
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They changed the design since peaty bought his IIRC. I too have a random tech. cat and did notice a differance
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Old 12-05-2002, 04:40 PM   #24
Frakk's2.5
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I am actually considering the Random Tech Cat thanks for all the good info! does anyone know where to get the Random Tech Cat besides Cobb? Hey also has anyone tried Tech Work Eng Stuff I.E. Cat/headers/ Exhaust?
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Old 12-05-2002, 05:33 PM   #25
Albert
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Have you given any thoughts to METALLIC cat (vice ceramic that RT uses).

I've been reading up on them, many tuners like them because they are more durable and less likely to fail on tuned engines which are more likely to run richer or hotter the oe specs.

I know of no Subaru vendor that currently sell a pre-fabbed pipe, but you can get a universal metallic cat for ~$175 and have your shop do a custom install.

My .02 cents

Last edited by Albert; 12-05-2002 at 05:39 PM.
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