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Old 11-12-2002, 07:24 PM   #1
wannaimpreza
Scooby Newbie
 
Member#: 14264
Join Date: Jan 2002
Location: st. louis MO
Vehicle:
'03 wrx
wrblue

Default twin dump or bellmouth?

i know sorry about another exhaust question
but i searched and could not find any info on this
i am getting ready to buy a down pipe and want to know which type is better for faster spool up and low end torque
if it helps i have an up-pipe and do not plane on upgrading the turbo
thanks and sorry if this has been asked before
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Old 11-12-2002, 08:06 PM   #2
SJwrx
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Member#: 14970
Join Date: Feb 2002
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
1997 GF8
multi

Default

This is a really good question. I would like to know too. MRT is Bellmouth, Vishnu is twin-dump, and it seems 1/2 is one way and the other half is the other way. So, what is a technical conclusion to this question?
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Old 11-12-2002, 09:03 PM   #3
PKer
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Member#: 27647
Join Date: Oct 2002
Chapter/Region: SCIC
Location: 69 Datsun SPL311
Vehicle:
06 MX-5-STR 03WRX
(ret), 08 Titan-Tow

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C'mon experts I want to know too.
I'm thinking about Scooby Sport turbo-back
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Old 11-12-2002, 09:19 PM   #4
silverscooby
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Join Date: Feb 2002
Location: NC
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With a twin dump downpipe you will be reducing cross-talk/turbulence in the collector area. Also, the wastegated exhaust gases bypass around the cat (which is a slight restriction.) Now if you run catless it isnt as big of an issue.

They are both good designs. I chose the twin dump though.
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Old 11-12-2002, 09:24 PM   #5
driggity
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Join Date: Jun 2001
Chapter/Region: TXIC
Location: Grapevine, TX
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2005 Legacy GT Wagon
2006 LJ Rubicon

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Well Vishnu does make both and claims the twin dump is better (and more expensive). If its worth the extra money is probably much more debateable. Although there is the Bosal as a cheap twin dump option.
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Old 11-12-2002, 10:08 PM   #6
Z1 Performance
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Do a search please..this has been talked about to death

Both have plusses and minuses

Adam
www.z1auto.com
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Old 11-12-2002, 10:40 PM   #7
Steppin Razor
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Chapter/Region: BAIC
Location: San Francisco
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2002 GGA 5MT
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And post what you find here. Please.
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Old 11-13-2002, 12:31 AM   #8
elite38
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Location: NYC
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03 WRX
WR BLUE

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The looks for the twin dump are killer! enough said!
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