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Do you need any type of flex joint when building a dual exhaust?

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Old 02-13-2009, 11:26 PM
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Default Do you need any type of flex joint when building a dual exhaust?

Do you need any type of flex joint when building a true dual (or sort of true dual with an H pipe) exhaust for a rear wheel drive car?

If you need one, where do you need to put it?

What kind of flex joints are out there, besides the metal-weave ones?
Old 02-13-2009, 11:42 PM
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Nope, you're good.
Old 02-14-2009, 01:32 AM
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no flex pipe!!!!!!!!!!!!!!!!!! there only good for a quick fix until you could have it done right. i have done an h pipe exhaust before i really dont know the performance diff between the two.
Old 02-14-2009, 01:55 AM
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Originally Posted by jam01
no flex pipe!!!!!!!!!!!!!!!!!! there only good for a quick fix until you could have it done right. i have done an h pipe exhaust before i really dont know the performance diff between the two.

what are you talking about. this isnt an x vs h discussion

I have flex pipes on mine. The engine does flex a bit since i don't have poly motor mounts. I thought it would be a nice thing to allow it to do it. I am the only system i have seen with these though. I'd imagine they are not necessary but they don't hurt my system.
Old 02-14-2009, 07:12 AM
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No need for flex pipes. Makes no sense to use them. Well, I did use one on my generator shed setup, but not on my car.
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Old 02-14-2009, 08:58 AM
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Thanks for the feedback guys.

So I can do all flat flanges... I don't need to do any ball flanges or other types of flexible flanges... whatever they may be??
Old 02-14-2009, 09:43 AM
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no.. look around in the true dual sticky at the top of this forum. I don't there there is a single car with flex pipes or any kind of flexible piping or joints at all.

https://ls1tech.com/forums/generatio...-pics-too.html

There isn't much of a reason to use on a longitudinal engine car as long as it has good motor mounts and the exhaust is built with enough clearance. A transverse engine car it would be a different story though.
Old 02-14-2009, 10:07 AM
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no flex needed. i have flanges on my headers for my true duals and hangers the rest of the way back(to right before the rear end) unbolting the header flanges drops the whole system....
Old 02-14-2009, 10:23 AM
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Awesome, thanks for the feedback guys.
Old 02-14-2009, 12:03 PM
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I think they would really help on our cars. I dont have them on my exhaust, but I wish I did. You can tuck the system up alot tighter without worrying about clearance with engine movement.

At work we use flex joints on every single car we put exhaust on. You can solid mount the exhaust the whole way to the back.
Old 02-15-2009, 03:42 AM
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flex joint
Old 02-15-2009, 11:27 AM
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Originally Posted by 99345hp
I think they would really help on our cars. I dont have them on my exhaust, but I wish I did. You can tuck the system up alot tighter without worrying about clearance with engine movement.

At work we use flex joints on every single car we put exhaust on. You can solid mount the exhaust the whole way to the back.
you can tuck it just as tight when you have poly motor mounts.....
Old 02-16-2009, 12:52 PM
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Originally Posted by 00cls1camaross



flex joint
sorry i thought he meant flex pipeing that bends. i forgot about those pipes.



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