downpipe size?
31 October 2009, 03:43 PM
#1
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downpipe size?
hi peeps.im gonna replace my up and downpipe next spring but was wondering,do all downpipes start at 3" coz im looking at a 3" to 2.5" pipe to match the rest of the system.i know you can also get 3" all thru but i take it these should match 3" systems only.its for a bug with standard turbo.also is a sports cat downpipe the way to go?i dont fancy having to put oe cat on every mot day!!!it would mess up the re-map too.(have i just answered my own question lol)
01 November 2009, 12:01 PM
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changing the centre is ok and straight forward but the down and up-pipe will need a re-map to gain full benefit and to be safe on the engine.
02 November 2009, 07:04 PM
#5
I think the bolt-holes on the centre section's OEM-sized 2.5" flange are elongated "ovals", thus allowing them to line up with a true 3" downpipe flanges' bolt-holes - although don't quote me on this!
If so, then you can also get a bigger 3" donut wirewool gasket to fit in there as well.
If so, then you can also get a bigger 3" donut wirewool gasket to fit in there as well.
Last edited by joz8968; 02 November 2009 at 07:05 PM.
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