it seems that some exhaust system's y-pipe don't have flex joints while others do.

anybody have a good perspective whether going with an exhaust system without flex joints would create a significant reduction in the system's longevity/reliability

thanks

 

One reason I bought my Nismo exhaust was because it included the flex joints. My reason for wanting the flex joints was that if Nissan spent the extra money to include them OEM, there must be a reason. If they wern't necessary, Nissan could have saved a few $'s not including them. And most manufactures think of pennies when cost cutting. So I trust Nissan's engineers won at the meeting with accounting!

 

That's exactly my school of thought. Manufacturers don't do something unless they have to.

Having said that I'm looking at the Amuse Ti Y which only has sprung slip joint.

 

All very true. Flex joints allow for vibrations and slight movements of the motor as the revs climb.
We have a torquey motor so over time I expect the engine mounts to wear a little, meaning some movement, which the flex pipes are designed to absorb.
Cracking of metal is possible.
In the Z's case I'd say any long term damage (if occurred) would be in the Y pipe.
Even if your exhaust contacts a speed hump or in/out of low driveways a flex pipe allows some movement which is better than bending pipes.

 

another reason could be to allow thermal expansion of the system. and another might be to allow some flexibility for installation.

 

As long as its not completely solid, its fine...its a long pipe and it heats and cools rapidly, so solid will crack over time.

The Amuse Ti with the spring joints performs the same function...just approaches it a bit differently, that's all

.

 

agree with all. some kind of flex joint would be a good idea when looking at an exhaust. without it don't be suprise if starts to rattle.