downpipe problem

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WillG
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Thu Nov 30, 2006 11:24 pm

guys doing my down pipe are struggling and telling me to go 2.5" instead of 3", i know fozzymonster managed it, has anyone else, anyone got any pictures. i think them problem is they just want to be able to weld a couple of elbows togther and thats it
e30cossie
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Thu Nov 30, 2006 11:32 pm

i have just spent the last 2 days making a 3" downpipe and system for my cosworth project and was a nightmare.Get some 3" fresh air ducting and tie it in the position you want your downpipe and then fill it with expanding foam then take it off car and copy.
e30_Turbo
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Fri Dec 01, 2006 12:33 am

You have to hug the block all the way down under number 6, there is only a 4 x 3 inch gap you need to use in order to make the 30 degree bend around the steering linkage and avoiding the block/belhousing.

You can always oval a small section of the 3 inch, not too much but 1/2 inch would be fine, also the bulkhead is quite soft when tapped with a BFH :D But you need the block out of the way to really get a good swing at it.

Mark.
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MR_SAZ
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Thu Jan 11, 2007 1:02 pm

pics?? pics?? pics??
mattG
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Fri Jan 12, 2007 12:11 pm

currently having mine made in 2.5" is this much of a disadvantage as the exhaust mouth ID is 2.5"
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blingsta
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Fri Jan 12, 2007 12:42 pm

mine is 2.5 and sounds awesome
Ant
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Fri Jan 12, 2007 6:04 pm

3 inch is optimal size.......

2.5 will do, but will restrict your ultimate power.
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