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Old 06-25-2003, 11:08 PM   #1
Dr Ken
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SilvAr

Default 2.25" vs 2.5" exhaust question

Hello, I've not posted in this forum before and am really very new to FI stuff.
I've ordered a TWE header and cat to complement my brullen cat back, all 2.25". If I were to add a (AVO?) turbo, how much performance would you think I'd be loosing by keeping this diameter piping instead of going up to 2.5"???
THanks,
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Old 06-26-2003, 12:01 AM   #2
Midwayman
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Depends on how much power you're running. 2.5" is good upto about 300bhp. so 2.25".... probably good enough for a 5psi kit without much loss. Bigger is always better with the turbo.
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Old 06-26-2003, 01:16 AM   #3
Eric SS
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swap and N20. gone. : (

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Quote:
Originally posted by Midwayman
Bigger is always better with the turbo.
Yeah. I'm a strong believer that you can never over exhaust a turbo car.
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Old 06-26-2003, 09:23 AM   #4
DanzBorin
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you will have to lose the headers when you turbo the car...

but yes, 2.5" would be better for boost...
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Old 06-26-2003, 11:06 AM   #5
Avenger
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Quote:
Originally posted by Eric v5.7 beta


Yeah. I'm a strong believer that you can never over exhaust a turbo car.
Darn.. I knew I should got a 5" exhaust.
I got a 2.5" exhaust and it works fine with 8 psi.
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Old 06-26-2003, 12:57 PM   #6
PHATsuby
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to stock is a project too

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which tech works header did you go with? the super stock one? i was told the super stock is best for turbo applications because the high output headers are tuned more for higher end and can only be taken advantage of if you have a raised rev limit.

i am hoping to get some soon once they find out if their older version will fit an automatic. tell me what you think of it once you get it cause it looks like great craftsmanship.


Quote:
you will have to lose the headers when you turbo the car...
i dont believe so because i was told they bolt up to the factory location so basically any of the aftermarket kits will work with it, which is sweet.

Ben
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Old 06-26-2003, 02:19 PM   #7
Dr Ken
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Yup, Super stock (2.25"), instead of the High output (2.5"). Stock end placement. There are two different ceramic coats available for its mild-steel construction: The shiny, is actually lower temperature rated, for N/A. The dull is for higher temps of forced induction, but more prone to debris chips. I chose the former, but still have time to change to the latter, if going FI with this header seems a reasonable option.

I suppose I'd be obligated to critique these headers once installed, as there are still only a few who have confessed to getting them.

I'm open to suggestions.
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