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Old 03-07-2006, 05:46 PM   #1
sandwi54
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Join Date: Aug 2005
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Location: Bay Area
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2005 WRX SRR
Cobb Stage 2

Default Torn between Crucial Racing shorty DP and Cobb high-flow DP

Currently I have a stock gutted UP, helix catted DP mated to stock catback, and AP stage 2. However, I think I am only getting a barely better low-end torque than stock. When I accelerate from a stop to redline I could still feel a turbo lag as the car suddenly pulls much harder past 3k rpm.
Some people told me that the placement of the cat in the helix catted dp is not optimal because it's too close to the turbo. So I am thinking about getting either a cobb high-flow dp or a crucial racing dp mated to the stock 3rd cat. Which one would give me a better low-end response? Or is my lack of low-end a result of missing a 3" catback? I searched and searched but no one ever directly mentioned this topic (regarding the placement of the cat vs. low-end torque).

Last edited by sandwi54; 03-07-2006 at 06:12 PM. Reason: Forgot to include the UP as a mod
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Old 03-07-2006, 05:48 PM   #2
J-Rex2004
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Don't waste your money.
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Old 03-07-2006, 06:07 PM   #3
keaniegenie
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Quote:
Originally Posted by sandwi54
Currently I have a helix catted dp mated to stock catback and AP stage 2. However, I think I am only getting a barely better low-end torque than stock. When I accelerate from a stop to redline I could still feel a turbo lag as the car suddenly pulls much harder past 3k rpm.
Some people told me that the placement of the cat in the helix catted dp is not optimal because it's too close to the turbo. So I am thinking about getting either a cobb high-flow dp or a crucial racing dp mated to the stock 3rd cat. Which one would give me a better low-end response? Or is my lack of low-end a result of missing a 3" catback? I searched and searched but no one ever directly mentioned this topic (regarding the placement of the cat vs. low-end torque).
The catback is part of it, but your uppipe is a large part of it too. Don't waste your money getting a better DP. Get an uppipe and a catback. There's a ton of other stuff that will help your bottom end performance you can add. Hell, a new catted dp is the cost of an uppipe plus install, depending on what you pay.
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Old 03-07-2006, 06:10 PM   #4
KingOfSiam
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Both DP's will yield similiar gains, it's not worth it to buy a whole nother one.
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Old 03-07-2006, 06:14 PM   #5
CGM_WRX
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Every catted JDM downpipe I have seen has the cat close to the turbo end. I am not sure if it has to do with emissions because they use a very expencive cat but I would like to know what the difference is.

I say spend your money on something else and keep the downpipe you have.
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Old 03-07-2006, 06:11 PM   #6
sandwi54
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Sorry I forgot to mention that I do have a stock gutted UP as well. So you guys think I should keep my helix catted DP and just get a catback?
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Old 03-07-2006, 07:14 PM   #7
dbrier
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Keep the Helix.
Spend your money on a catback.
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Old 03-07-2006, 08:07 PM   #8
Spenk
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Buy a good catback and get it pro tuned.

Money better spent.
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Old 03-07-2006, 08:11 PM   #9
nate49509
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witty comment goes here

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I was kind of torn between the two, but then said screw it. I'm getting a Helix catted DP. Its the cheapest and seems to be great quality.
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Old 03-07-2006, 08:36 PM   #10
sandwi54
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Ok i think you guys have convinced me that cobb catted or crucial racing DP won't give more low-end torque than the helix catted. i'll go for a catback then.
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Old 03-07-2006, 08:39 PM   #11
nate49509
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witty comment goes here

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The stock muffler is a major bottle neck in the system.

http://forums.nasioc.com/forums/show...=stock+muffler
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