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

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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wannaimpreza is offline   Reply With Quote
Old 11-12-2002, 08:06 PM   #2
Scooby Specialist
Member#: 14970
Join Date: Feb 2002
Chapter/Region: BAIC
Location: San Jose, CA
1997 GF8


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?
SJwrx is offline   Reply With Quote
Old 11-12-2002, 09:03 PM   #3
Scooby Specialist
Member#: 27647
Join Date: Oct 2002
Chapter/Region: SCIC
Location: 69 Datsun SPL311
06 MX-5-STR 03WRX
(ret), 08 Titan-Tow


C'mon experts I want to know too.
I'm thinking about Scooby Sport turbo-back
PKer is offline   Reply With Quote
Old 11-12-2002, 09:19 PM   #4
Scooby Specialist
Member#: 15060
Join Date: Feb 2002
Location: NC

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.
silverscooby is offline   Reply With Quote
Old 11-12-2002, 09:24 PM   #5
Scooby Specialist
Member#: 7453
Join Date: Jun 2001
Chapter/Region: TXIC
Location: Grapevine, TX
2005 Legacy GT Wagon
2006 LJ Rubicon


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.
driggity is offline   Reply With Quote
Old 11-12-2002, 10:08 PM   #6
Z1 Performance
Former Vendor
Member#: 9327
Join Date: Aug 2001
Location: Z1Auto.com

Do a search please..this has been talked about to death

Both have plusses and minuses

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Old 11-12-2002, 10:40 PM   #7
Steppin Razor
Scooby Specialist
Member#: 24035
Join Date: Sep 2002
Chapter/Region: BAIC
Location: San Francisco
2002 GGA 5MT
Seal Gray


And post what you find here. Please.
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Old 11-13-2002, 12:31 AM   #8
Scooby Newbie
Member#: 24544
Join Date: Sep 2002
Location: NYC
03 WRX


The looks for the twin dump are killer! enough said!
elite38 is offline   Reply With Quote

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