[austinla335d]

Originally Posted by GreekboyD

Why do you think this would be better?

CFM.

I've read plenty of members stating they would still like to split the exhaust for dual outlets

[GreekboyD]

Originally Posted by austinla335d

CFM.

I've read plenty of members stating they would still like to split the exhaust for dual outlets

I agree with you but was wondering what the benefit is in scaling down from 3" to 2.5" instead of just running 3" the whole way.

[austinla335d]

Originally Posted by GreekboyD

I agree with you but was wondering what the benefit is in scaling down from 3" to 2.5" instead of just running 3" the whole way.

No benefit at all in my book :-D

Technically, it would open up even further at the Y junction of 3" to effective 5" of the dual 2.5", but airflow might not like the angles or something along those lines. I'm no expert. If keep it full 3" if it were me, but definitely add a lightweight muffler or resonators galore. Hate the sound of open exhaust diesels... Reminds me of inland empire bro's in big trucks blowing black smoke.
I'd love to keep the exhaust clean and smooth but add aggressive throaty roar as well.

[GreekboyD]

Originally Posted by austinla335d

No benefit at all in my book :-D

Technically, it would open up even further at the Y junction of 3" to effective 5" of the dual 2.5", but airflow might not like the angles or something along those lines. I'm no expert. If keep it full 3" if it were me, but definitely add a lightweight muffler or resonators galore. Hate the sound of open exhaust diesels... Reminds me of inland empire bro's in big trucks blowing black smoke.
I'd love to keep the exhaust clean and smooth but add aggressive throaty roar as well.

Interesting point about the resonators.

[GreekboyD]

Two different exhaust notes here:

[Yozh]

I like the red Audi sound. But then the second video has a lot of echo in it so sounds louder.

[DieselRacer]

I will do a 3.0 inch all the way if it fits, on my tdi's I always did a 2.5 because it fit without any modifications, I will not use a resonator or muffler, so straight pipe from turbo back...

[starrfyr]

Originally Posted by TDIwyse

Possibly, if you do it in such a way that it doesn't trigger a plausibility error. The DDE is balancing a lot of information from the various sensors.

I've been reading your posts in VWVortex, when I had a VW A5 TDI, and now here for over 5 years. A sub-12 sec 1/4 mile is extremely impressive.

[starrfyr]

Originally Posted by austinla335d

No benefit at all in my book :-D

Technically, it would open up even further at the Y junction of 3" to effective 5" of the dual 2.5", but airflow might not like the angles or something along those lines. I'm no expert. If keep it full 3" if it were me, but definitely add a lightweight muffler or resonators galore. Hate the sound of open exhaust diesels... Reminds me of inland empire bro's in big trucks blowing black smoke.
I'd love to keep the exhaust clean and smooth but add aggressive throaty roar as well.

Your geometry is slightly flawed. 2 x 2.5" pipes are not equal to a 5" pipe. The cross-sectional area of two 2.5" pipes is equal to (2)(25/16)(Pi), while a 5" pipe is equal to (25/4)(Pi). A 5" pipe is twice as large as two 2.5" pipes.

By comparison, a 3" pipe has a cross-sectional area of (9/4)(Pi). If you compare a 3" pipe to two 2.5" pipes you can ignore Pi and the ratio of two 2.5" to a 3" is 25/18 or about 139%. Since the 2.5" pipes are probably cheaper and lighter than 3" pipes, and since two 2.5" pipes have almost 40% more flow capacity than the 3" down pipe, it seems prudent to go with the 2.5" pipes after the intersection.

However, if a 3.5" DP were used then with 2.5" pipes the excess volume drops to just over 2% which isn't enough. One might consider 3" pipes in the case of a 3.5 or 4" DP. And, yes, I recognize that a 4" DP, and probably a 3.5" as well, is clown-shoes excessive. I only mention it because twin 3" all the way to the tips also seems excessive since twin 2.5" pipes provide nearly 40% more flow than a single 3", which is the practical maximum for the down pipe.

[oldsankey]

Not sure if you guys are still looking for the 3" SS straight pipe exhaust thread from Maryland...I think that's my car you're referring to. Here is the link to the thread:

http://www.e90post.com/forums/showthread.php?t=958593

[GreekboyD]

Originally Posted by oldsankey

Not sure if you guys are still looking for the 3" SS straight pipe exhaust thread from Maryland...I think that's my car you're referring to. Here is the link to the thread:

http://www.e90post.com/forums/showthread.php?t=958593

Yes, you did work at Jarek's and I remember you emailing me a video of your exhaust.

[oldsankey]

Yep. At that time, Jarek did the DPF removal and tune all at once...whereas now I think he's only doing the tunes...

[GreekboyD]

Originally Posted by oldsankey

Yep. At that time, Jarek did the DPF removal and tune all at once...whereas now I think he's only doing the tunes...

I swear that guy Jarek thinks I'm a cop for sure. Went there with my car last summer, showed him all the mods on it, etc and he still had that look of:

"I don't trust this guy."

[DieselRacer]

What's hard about trusting a Canadian...

[GreekboyD]

[iaknown]

Here's a little teaser of my exhaust. Almost done it. Sorry for the crappy pic. I'm doing like 5 things at once on the car so it'll be a little bit until I can post sound clips. This will be an affordable solution for aftermarket exhaust on our cars, just have to figure out how to make sure it fits everybody's cars with different downpipes (like those that fit and those that don't ). You can't see the tips but they are 3.5" although I will be hacking mine off to put quads on. More info to come later....

[dzlmoose]

Originally Posted by GreekboyD

I like that a lot.

[iaknown]

So how much is the Abgasanlage exhaust?

[DieselRacer]

Originally Posted by iaknown

Here's a little teaser of my exhaust. Almost done it. Sorry for the crappy pic. I'm doing like 5 things at once on the car so it'll be a little bit until I can post sound clips. This will be an affordable solution for aftermarket exhaust on our cars, just have to figure out how to make sure it fits everybody's cars with different downpipes (like those that fit and those that don't ). You can't see the tips but they are 3.5" although I will be hacking mine off to put quads on. More info to come later....

Did the fabricator saves the measurments on your exhaust so we all can just buy then from him ,it would be a easy process... it looks awesome

[TDIwyse]

Originally Posted by iaknown

Here's a little teaser of my exhaust. Almost done it. Sorry for the crappy pic. I'm doing like 5 things at once on the car so it'll be a little bit until I can post sound clips. This will be an affordable solution for aftermarket exhaust on our cars, just have to figure out how to make sure it fits everybody's cars with different downpipes (like those that fit and those that don't ). You can't see the tips but they are 3.5" although I will be hacking mine off to put quads on. More info to come later....

That's beautiful.

[GreekboyD]

Originally Posted by TDIwyse

That's beautiful.

I concur.

Eagerly awaiting the aural experience next.

[iaknown]

Originally Posted by DieselRacer

Did the fabricator saves the measurments on your exhaust so we all can just buy then from him ,it would be a easy process... it looks awesome

I am the fabricator Unfortunately it is not that easy as there is nothing in production for the mid section that is even close. There is not much room on our cars to work with and I still need to come up with a mount near the trans area like the factory pipe. But hopefully I can find a way to streamline the process afterwards so it's not too much work to make more....