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Flexible mesh section in 1.9 downpipe
by
Mattg
on 23 Jul, 2007 10:30
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the flexible section of my downpipe for my golf is leaking pretty badly. I was going to remove it a take it to an exhaust shop and get a new section welded in I was thinking is the that flexible section important?
Can I get a straight piece of pipe welded in instead of another flexible section?
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#1
by
Jetta Fan
on 23 Jul, 2007 10:49
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That flex section allows the downpipe to move with the motor (torque moves the motor fore and aft some). Bolting in apiece of straight pipe will make the exhaust system rigid and prone to cracking, or so I was told by a muffler shop when I wanted to replace it with straight pipe on a previous car).
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#2
by
Infinitrium
on 23 Jul, 2007 11:30
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You can get replacement flex pipes at Canadian Tire, they run about 40-50 bucks.
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#3
by
addautomotive
on 24 Jul, 2007 05:44
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You can get replacement flex pipes at Canadian Tire, they run about 40-50 bucks.
Yep, but mark & measure very carefully first. The canadian tire sections are either too long or too short, and it's very hard to make one work. I managed, but it was a bit too long and the DP was forever bonking against the crossmember/subframe. I gave up and put in a new one.
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#4
by
commuter boy
on 25 Jul, 2007 07:22
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For the time and hassle, you may as well put in one of Dave's 2.5" downpipes. They're much sturdier built.
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#5
by
addautomotive
on 26 Jul, 2007 04:41
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For the time and hassle, you may as well put in one of Dave's 2.5" downpipes. They're much sturdier built.
+1
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#6
by
Makebeleaf
on 04 Nov, 2009 17:56
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How do you replace this flex pipe? I know you unbolt from the turbo but how do you get the flex piece off of the bolt on part?
I see under the car after the flex pipe there are no clamps...how do I remove the flex pipe from that end.
Exhaust and smoke are coming out of my flex pipe. I guess its worn out.
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#7
by
Makebeleaf
on 16 Nov, 2009 04:39
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Also, what is "one of Dave's 2.5" downpipes" and where to I find one?
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#8
by
macka
on 16 Nov, 2009 05:22
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How do you replace this flex pipe? I know you unbolt from the turbo but how do you get the flex piece off of the bolt on part?
I see under the car after the flex pipe there are no clamps...how do I remove the flex pipe from that end.
Exhaust and smoke are coming out of my flex pipe. I guess its worn out.
the flex pipe is a unit from flange to flange. Any good car parts store has a book of muffler parts. If you know the length and OD you'll be styling. I have one from Napa. Ordered it from the book in June.
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#9
by
Smokey Eddy
on 17 Nov, 2009 13:48
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every part store (pretty well...) can get you a flex pipe.
If you don't use a flex you put incredible stress on the studs that hold that exhaust manifold to the head... the weight of the cast manifold + very heavy turbo on a fairly lengthy lever arm (by this point, out there on the manifold) and then ADD to that the exhaust with all that lever arm length. The torque on the turbo & studs in the head would be phenomenal. If you then hung the exhaust to the car with nothing isolating the engine rattle you would get some groovy vibrations through the floor. ALSO it would act like an engine mount.. when the block wants to twist the solidly mounted exhaust would try and hold it still... bad bad news.
I know everyone has already said you need a flex but first hand i experienced a bolt being pulled out of my turbo from my very heavy downpipe (currently building a new one).
Drill, lots of sweat & a heli-coil later...
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#10
by
commuter boy
on 22 Nov, 2009 14:34
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Also, what is "one of Dave's 2.5" downpipes" and where to I find one?
Passenger Performance, but they're not in the downpipe business anymore AFAIK. You might be able to pickup a used one.