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Old 02-26-2004, 03:38 PM   #1
mo_boost
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04 FXT
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Default Cobb Down-Pipe

COBB Has recently updated their website. They have Released their Down-Pipe for the XT. Looks to be a well engineered piece.

Perrin
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Old 02-29-2004, 09:01 AM   #2
Peaty
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I'm interested in it myself, with the cat. I've sent them a few questions about it.

I've never done a down or up pipe for that matter, anyone have an idea how difficult a down pipe is to replace? Just curious. I have the Cobb Cat-back so they should go nice together.

Peaty
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Old 02-29-2004, 09:03 AM   #3
Hondaslayer
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Quote:
Originally posted by Peaty
I'm interested in it myself, with the cat. I've sent them a few questions about it.

I've never done a down or up pipe for that matter, anyone have an idea how difficult a down pipe is to replace? Just curious. I have the Cobb Cat-back so they should go nice together.

Peaty
Piece of cake.

If you are going to do a up-pipe do it while you are doing the downpipe. Makes life alot easier.
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Old 02-29-2004, 01:28 PM   #4
Ghostrider600
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What real-world/dyno gains do you actually get?

I know it's a common mod, but what's the HP:$$ ratio for it all?
(All= Up & Down pipes, Cobb Cat-back)
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Old 02-29-2004, 01:52 PM   #5
Peaty
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Quote:
Originally posted by Ghostrider600
What real-world/dyno gains do you actually get?

I know it's a common mod, but what's the HP:$$ ratio for it all?
(All= Up & Down pipes, Cobb Cat-back)

That was one of my questions to Cobb
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Old 02-29-2004, 06:08 PM   #6
mo_boost
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A few months ago, I hepled one of good friends(SCRAPPYDO) install a Turbo XS downpipe on his WRX. It was super simple. If you can install a cat back, you should have no trouble installing the downpipe. I noticed a big difference when driving his car. I feel a down pipe is a big bang for the buck. A down pipe will help the XT spool up quicker and hold boost longer, however the thing that will help it the most is a reflash. The stock XT boost control maps keep the turbo fom spooling up right away(http://forums.nasioc.com/forums/show...hreadid=482138). An up-pipe IMO will not buy you near as much as the downpipe.

Just my thoughts,

Perrin

Last edited by mo_boost; 02-29-2004 at 06:17 PM.
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Old 02-29-2004, 06:23 PM   #7
Peaty
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I replaced my two cats on my RS with the high flow from Cobb some years ago. I have to say it was a worth while mod, the difference was very noticable. The only drawback, which is one I'm concerned with here, is the sound level went up about 1.5X making my RS a lot louder.
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Old 03-01-2004, 06:48 PM   #8
mo_boost
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My friend claims that his WRX is not much louder since we installed his downpipe and removed both cats. Of course he already had a cat back exhaust, not sure if that will amplify or dampen the soundlevel when removing both cats. Of course catalytic conveter technology/design changes fairly often.

Perrin
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Old 03-01-2004, 09:51 PM   #9
Ghostrider600
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Quote:
Originally posted by mo_boost
My friend claims that his WRX is not much louder since we installed his downpipe and removed both cats. Of course he already had a cat back exhaust, not sure if that will amplify or dampen the soundlevel when removing both cats. Of course catalytic conveter technology/design changes fairly often.

Perrin

He ever get a chance to dyno it?
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Old 03-02-2004, 01:24 AM   #10
wadejg
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Something to consider in difference between the RS and the WRX/XT is the muffler effect found in a turbocharger.

Has anybody ever heard an unmuffled non-turbo RX-7? It is WICKED loud. However, that same engine with a turbo and no muffler is still relatively quite.

Regards,
Justin Wade
2004 FXT
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Old 03-02-2004, 09:44 AM   #11
SCRAPPYDO
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Hey boost!

You are right, my sound did not get louder, the tone just changed. You hear much more of the exhaust sound resonating in the downpipe. I presently have a Steathback system from Turbo XS and I am quite happy with the performance, and spool-up. The Cobb piece looks more beefy, while the Turbo XS pipe is just massive. I could litterally stick my entire arm down the downpipe and there would be room to spare. Its was a well made piece, but compared to this Cobb alternative, I may wish I would have waited.

What I like about the cobb pipe. First its bellmouth is cast, which would immediately tell me its thicker. There are hundreds of posts complaining about the wastegate fluttering noise that people with the Stealthback (or any other similar design) downpipes have. Some folks dont care, others get annoyed seriously. I am somewhere in the middle. If I were to do it all over again, I would probably choose the Cobb peice, simply due to the increased thickness and the subued wastegate flutter facter. I do not think that one would flow that much better than the other, or HP numbers are any greater with one than the other. The Turbo XS pipe is incredibly well made, make no mistake, and it definitely works. But I would not mind giving This one a try!

Hope that helps.

SCRAPPYDO
stephen
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