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Old 17-03-2018, 05:01 PM   #1
Vortex-98
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Default Exhaust size velocity vs volume

I'm trying to get the exhaust sounding a bit better ,I'm getting sum new headers but when it comes to size it gets a balancing act ,the smaller diameter exhaust pipes better for velocity an moving the air faster than a bigger diameter which is more for volume r but as it has 2 pipes on the inlet the noise they make isnt pulsing in harmony an they cancel the flow of the other making for a stock idle..
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Old 17-03-2018, 09:06 PM   #2
T3rminator
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Default Re: Exhaust size velocity vs volume

Do you have a big merge pipe in your current system? If you do, remove it or make the merge section much smaller.

I've never heard a bad sounding AU V8.
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Old 22-03-2018, 12:29 AM   #3
NCII40
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Default Re: Exhaust size velocity vs volume

Manta Cat back
High Flow Cats recommended
H pipe already on the kit

https://www.youtube.com/watch?v=RipCZpvv_ag

https://www.ebay.com.au/itm/MANTA-PE...-/172378990840
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Old 24-03-2018, 01:03 PM   #4
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Default Re: Exhaust size velocity vs volume

Tickford 4 into1 extractor an cats into 3 or 3.5 mandrel into centre muffler an then 3in resonator...I'm thinking of fitting a twin system from Cats back,after I get my extractors fitted...can extractors stock xr8 or paceys be fitted an removed easily or do I have to take it to a shop to get it up on a hoist
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Old 26-03-2018, 02:26 PM   #5
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Default Re: Exhaust size velocity vs volume

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Originally Posted by Vortex-98 View Post
Tickford 4 into1 extractor an cats into 3 or 3.5 mandrel into centre muffler an then 3in resonator...I'm thinking of fitting a twin system from Cats back,after I get my extractors fitted...can extractors stock xr8 or paceys be fitted an removed easily or do I have to take it to a shop to get it up on a hoist
A single 3 inch is actually smaller than the factory twin 2 inch.

Go twin 2.25.
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Old 26-03-2018, 05:06 PM   #6
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Default Re: Exhaust size velocity vs volume

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A single 3 inch is actually smaller than the factory twin 2 inch.

Go twin 2.25.
No it isn't.
A 3" single has about 12% more area than twin 2".
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Old 27-03-2018, 02:17 PM   #7
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Default Re: Exhaust size velocity vs volume

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No it isn't.
A 3" single has about 12% more area than twin 2".
But not as much as twin 2.25, which is what he should use.
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Old 27-03-2018, 03:59 PM   #8
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Default Re: Exhaust size velocity vs volume

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But not as much as twin 2.25, which is what he should use.
Depends what he's chasing.
As I understand his engine is very mild, so a single 3" is probably better than dual 2.25".
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