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exhaust centre box

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Old 08-01-2008, 05:48 AM
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Originally Posted by Spykee,Aug 1 2008, 01:36 PM
That sounds like a great plan! Even better would be a drive by, easily done these days on a decent mobile phone
ohh yes!

go on go on go on
Old 08-01-2008, 05:54 AM
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Originally Posted by Ajs_s2k,Aug 1 2008, 05:48 AM
ohh yes!

go on go on go on
I can't, I've not done the mod but would be interested in hearing it myself!

10/10 for your enthusiasm at the prospect of me doing it tho
Old 08-01-2008, 05:57 AM
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Originally Posted by Spykee,Aug 1 2008, 01:54 PM
I can't, I've not done the mod but would be interested in hearing it myself!

10/10 for your enthusiasm at the prospect of me doing it tho
Sorry i was posting it at the guy who created the post
Old 08-01-2008, 06:04 AM
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Originally Posted by chachaman,Jul 30 2008, 02:49 PM
what about exhuast back pressure? Even the aftermarket systems retain a box, n/a cars usually need back pressure to help them work more efficiently turbos need straight throughs! Or is that box just there to keep the noise down?
No engine needs back pressure.

Having too big an exhaust actually increases back pressure.
Old 08-08-2008, 08:29 AM
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Has this done today and would recommend it.

Doesn't sound overly different but the car was quite loud with the FIPK anyway. By removing the centre box it's merely raised the sound somewhat but not by too much.

Also when letting off after giving it the beans, tends to make a rasping sound which, to be honest, not sure if I'm fond of yet. I'm sure it'll grow on me though
Old 08-08-2008, 09:00 AM
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Originally Posted by Si2k,Aug 1 2008, 03:04 PM
No engine needs back pressure.

Having too big an exhaust actually increases back pressure.
Not correct Im afraid.

No 4 stoke engine needs back pressure.

Non valved 2 stroke engines require an optimum amount of back pressure.

Or the fresh air/fuel mix will be ejected along with the exhaust gas during compression stroke.

Old 09-09-2008, 01:14 AM
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Has anyone produced a soundclip yet?
Old 09-09-2008, 01:37 AM
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Originally Posted by m1bjr,Aug 8 2008, 06:00 PM
No 4 stoke engine needs back pressure.
Not back pressure as such, but the pressure in the exhaust and the length of the exhaust needs to be right so that you get a low pressure pulse coming back up the exhaust just as each exhaust valve opens.
Old 09-09-2008, 01:53 AM
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So in your opinion do think its a bad idea removing the resonator, i dont see why not?.

The resonator is used to reduce sound but it also creates a slight bottle kneck - i cant see it doing much harm to performance and such?
Old 09-09-2008, 03:44 AM
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would any exhaust fitting center do this or is it a specialised thing to do?


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