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Will a Full 3'' Downppie fit with a 2.5'' center section??

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Old 19 September 2006, 07:00 PM
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~DrEaM~
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Default Will a Full 3'' Downppie fit with a 2.5'' center section??

okay am thinking of getting a Decat downpipe for my scoob.. and i got a choice from 3'' or 2.5''

my current cat back system is a 2.5' flange but if i get a 3'' downpipe with a 3'' flat flange will it fit ??

thanks
kev
Old 19 September 2006, 07:03 PM
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grantyb
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all depand on what make your exhaust is
Old 19 September 2006, 07:06 PM
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Originally Posted by grantyb
all depand on what make your exhaust is
the current cat back exhaust is a Fujitsubo cat back with fits to the standard downpipe atm...
Old 19 September 2006, 07:29 PM
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Old 19 September 2006, 07:56 PM
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ian10
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2.5 " inch open neck downpipe is good enough unless you are running big power
plus the system will join "well" and flow better
Old 19 September 2006, 08:30 PM
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Jay m A
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It will fit if both are designed to mate with the OE system. Most 3" downpipes do
Old 19 September 2006, 09:42 PM
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Originally Posted by ian10
2.5 " inch open neck downpipe is good enough unless you are running big power
plus the system will join "well" and flow better
it wil be going on a STI newage JDM twin scroll so not big power but either small power
Old 19 September 2006, 09:42 PM
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Originally Posted by Jay m A
It will fit if both are designed to mate with the OE system. Most 3" downpipes do
so what you mean is as long as the holes match up then it will fit?

thanks
kev
Old 19 September 2006, 10:42 PM
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Jay m A
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Yes, but you will have a 6mm lip in the wrong direction.
Old 20 September 2006, 01:52 AM
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if your cat back is a 3" pipe down to 2.5" flange then i'd say get the 3" then have the 2.5" part cut out and wield in a 3" pipe and 3" flange then you'l have a true 3" exhaust for better a flow. thats what i did with my blitz
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