By looking at the pics, it looks like it would bolt onto the stock dp. I wonder what the diameter is...... sure doesn't look like they increased the size much from stock.

 

Judging from the welds of the pipe to the flange and materials, the Megan doesn't look like a full cast pipe.

 

The piping is cast but the flange isn't

 

^^ it looks very OEM...nice but is that all the way 3"? i just checked the website in post 1 and in seems to direct fit in OEM dp...so i'm assuming it's not 3" all the way...i could be wrong...

 

Understand that the main reason the the Evo X's O2 Housing is so tightly angled (which is bad for flow) is because they need that one part to be compatible with both LHD and RHD models. On RHD X's the steering rack is extremely close. This obviously isn't a problem for LHD X's, which is why we can make a better flowing product that utilizes all of the free space available. On top of tht, our one-piece O2 DP combo helps us eliminate the donut gasket connection which in itself is not 3" and therefore a restriction.

Darryl
www.ultimate-racing.com

 

We actually buy back our customers' Ultimate Racing Short Downpipe when they decide to upgrade to our Long O2 Downpipe .

PM me for details.

Darryl
www.ultimate-racing.com

 

i see now...thanks for that info

 

do you understand where the stress goes when there is no flex?

the exhaust is conected to the turbo, a solid mount... the turbo is connected to the manifold.....the manifold is conected to the block/head......... when the engine moves under torque and the exhaust is solid where do you think the stress is released? That constant torquing of the engine, is putting stress on the entire system.....

a proper manifold/turbo brace is there to try to keep the stress off the manifold bolts....

I'm sorry, but you are very wrong... a properly designed exhaust has everything to do with the manifold.... There is a reason flex pipes are incorporated into exhausts.

Have you ever had the pleasure of helicoiling a manifold bolt/stud?

 

So how essential is the heat shield? AMS is the only 02 Housing that retains it. The Megan, T1R, and Extreme units don't.

 

Do YOU know how the dounut flange works? It allows you to flex the joint without putting stress on the exhaust manifold bolts/studs that you're so worried about. Unlike the flex joint, it also gives you some stretch play from the spring loaded bolts which would also contribute to less stress on the manifold bolts/studs.

If the dounut flange puts so much stress on that area compared to the flex joint, then we'd be breaking manifold bolts/studs left & right since the stocker uses the same setup.

And yes I have experience in helicoiling cylinder head studs and turbo outlets, but that has nothing to do with this conversation.

 

Yup, lets just agree to disagree.... you clearly know what you are talking about. You are right, donut flanges have great range of movement, and people normally torque them correctly

 

could someone explain to me what the difference is between the 02 housing and just a standard downpipe? I thought they were basically the same thing?

 

^^ o2 housing is the one connected to the turbo..dp is connecting the o2 housing and testpipe...but there are combos like AMS that is one piece that says O2/DP combo...

so:

o2 + dp + tp + cbe = evo full exhaust
or
o2/dp combo + tp + cbe = evo full exhaust

 

anyway, i hope someone would post up the measurements of the inner diameter of this o2 housing........

 

x2 would be good to know so I can decide whether to replace my whole downpipe.