Flexi or not to flexi?

[newyorkaddict]

So the flexi has gone on my DC Sports exhaust manifold, I've ordered a replacement, but have noticed a lot of other brand manifolds don't use a flexi section. How do you get away with cracking on this style of mani? The DC is recommended to be used with ES Energy mounts to protect the flexi, I was just wondering if there was any reason stopping me from fitting a straight piece of piping instead of replacing the flexi section?

 

[davidpingu]

If I recall from previous threads, by using a straight piece of pipe you increase stress on welds in other parts of the system and eventually something more expensive will break.

Mark_teg recently had his flexi replaced on his DC manifold. Was pretty cheap from what I remember and I think he said its the first time its gone in 4 years or so. If it's going to go its probably the best place for it to as its a cheap fix.

As you've suggested, ES mounts will help a lot. Without them you could be looking at much more regular repairs. Circa £27 well spent for sure

 

[Wingnuttzz]

A lot other manifolds use sleeved fit sections that will naturally allow some movement, hence maybe removing the need for a flexi section.

For the DC manifold, if as Davidpingu said, without a flexi you will likely damage the welds somewhere on the manifold which I imagine could end up being move expensive.

Do you have ES inserts at the moment?

 

[newyorkaddict]

Ches lads. Wingnutzz, I don't know if I do or don't as I haven't really changed much mechanically on the car since I got it a year ago. Now I'm starting to put a few new bits on,I m finding the little issues here and there. I'll get some of the inserts sorted and just carry on with the flexi being replaced. Thanks for the help though boys, appreciated.

 

[dotty]

My feels has four flexi sections 😊

 

[C&S Evo7]

an exhaust designed for road will have flexis, a proper race exhaust normally wont, simply put any race car will be expected to have solid mounts or at the very least seriously uprated ones, any flexi joint disrupts the airflow as they are not parallel inside

 

[maxvr6]

My feels has four flexi sections

I have only just noticed this while perusing parts, seems to be the only uprated manifold you can get that has 4 flexi's, does this mean you're not running the inserts or a torque damper? Whats uncle toms view?

 

[beppe786]

Jdm Maxim work header also has 4 flexi pipes.. didn't know flexi disrupts flow :xaiweb6: ... my new kid racing header has no flexi :xyes:

 

[maxvr6]

I had spotted this one actually but under the name Suruga performance

Edit; oh i see they're just a reseller of the maxim works one

 

[maxvr6]

Still curious to know if the Feels manifold can be run without the need for inserts or uprated mounts?

 

[beppe786]

Still curious to know if the Feels manifold can be run without the need for inserts or uprated mounts?

i don't see why not as that has 4 flexis also..