2.5" versus 3" exhaust

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amulheirn
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2.5" versus 3" exhaust

Post by amulheirn » Mon Jul 22, 2019 9:58 am

I think the original cobras had 2.5" exhaust systems, is that right? I think the Hawk one is a 3" one (not actually measured it though - maybe I need to recalibrate my eye).

Anyway, I thought this piece of testing by Hotrod magazine was quite interesting:

https://www.hotrod.com/articles/engine- ... h-exhaust/

peterc
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Re: 2.5" versus 3" exhaust

Post by peterc » Mon Jul 22, 2019 6:34 pm

Well who’s a lucky boy if you have a 3” or even a 2.5”
Just measured mine at 2.25” at the down pipe and 2.125” for the remainder. Suggests 2” bore with 1/16” wall.
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simonjrwinter
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Re: 2.5" versus 3" exhaust

Post by simonjrwinter » Mon Jul 22, 2019 7:10 pm

It’s not how big it is...it’s how you use it....😜
TR6 (V8) Hawk 289 FIA (V8) Doing my bit for global warming.

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Re: 2.5" versus 3" exhaust

Post by monster7 » Mon Aug 19, 2019 9:34 pm

Gents,
i'm in the situation to re-do my exhaust system and i'm wondering if anyone is using and can thereof provide some pictures and infos of Gerrys standard setup for the 289 FIA sidepipes (siderails). I have some inserts from Classicchambered Exhaust which will fit into a 3'' pipe (no muffler visible from outside), and i think Gerry setup could be at least a good starting point.
Thank you for the help!
Ronald

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nikbj68
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Re: 2.5" versus 3" exhaust

Post by nikbj68 » Tue Aug 20, 2019 2:16 am

Here is one of my sidepipes, the downpipes from the headers are 2 1/4”.
(Rover 3.5)
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371DDCA8-2CD7-4F9E-87E4-80FFBD71587D.jpeg
Hawk 289 FiA...AT LAST!!!

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Migge
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Re: 2.5" versus 3" exhaust

Post by Migge » Tue Aug 20, 2019 10:34 am

What is the additional bemd for?
Special customized BRA289

Karl
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Re: 2.5" versus 3" exhaust

Post by Karl » Tue Aug 20, 2019 3:07 pm

The additional bend is to connect a silencer (when needed)
Karl

Frank289
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Re: 2.5" versus 3" exhaust

Post by Frank289 » Tue Aug 20, 2019 3:39 pm

Untouchable, i think im one of the lucky ones who has no sound restriction on my car papers, there is somewhere a code where police can see that. So i can put anything unther my obra and no ticket, just have to make some demoers for the TUV

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Re: 2.5" versus 3" exhaust

Post by monster7 » Tue Aug 20, 2019 3:45 pm

Thanks for the picture Nic :)

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Migge
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Re: 2.5" versus 3" exhaust

Post by Migge » Tue Aug 20, 2019 5:17 pm

Additional 2nd silencer? too heavy :-)
Special customized BRA289

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