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Author Topic: Cts outlet pipe  (Read 2543 times)

Offline percy

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Cts outlet pipe
« on: November 12, 2016, 02:29:53 pm »
Is anyone running a cts turbo discharge/ outlet pipe? If so is the quality any good, fitment etc?

Offline pudding

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Re: Cts outlet pipe
« Reply #1 on: November 14, 2016, 01:09:31 pm »
I ran a Spulen one on my ED30 engine and noticed absolutely nothing, so put the stock one back on  :grin:


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline percy

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Re: Cts outlet pipe
« Reply #2 on: November 14, 2016, 01:31:05 pm »
Thanks pud

Offline pudding

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Re: Cts outlet pipe
« Reply #3 on: November 15, 2016, 10:35:57 am »
There might be a small benefit on a K03 car with the 'pancake' discharge pipe, but on K04 cars, save your money!  The OEM one is fine  :smiley:


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline Paradox1

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Re: Cts outlet pipe
« Reply #4 on: November 15, 2016, 11:45:49 am »
Yeah the k03 ones are actually flat lol. a bit silyl really

Offline pudding

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Re: Cts outlet pipe
« Reply #5 on: November 15, 2016, 12:32:40 pm »
Even that doesn't reduce flow as much as people think it does, because all that's changed is the shape of pipe, not the diameter.

A squished pipe just looks counter intuitive and people replace it with a round one, but it's no different to squeezing the end of a garden hose.  It creates a head of pressure and accelerates the water flow.  I don't know if that was VW's intention, but it's certainly the physics behind it at least!  I can't believe it was done for space as the K04 has a round pipe.


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline Paradox1

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Re: Cts outlet pipe
« Reply #6 on: November 15, 2016, 01:26:27 pm »
Doubt it would be done for space.  no explanation why they are not the same really, as both have the silicone connector in the same place, just going to different locations. Even the k04 reduces in size towards the turbo.


Offline pudding

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Re: Cts outlet pipe
« Reply #7 on: November 15, 2016, 02:32:51 pm »
It's weird.  Ford did the same thing with the Focus RS exhaust.  They squashed the pipe flat at a particular section which a 3" pipe fits in just fine!  But people fitting aftermarket exhausts are finding minimal gains.  We can only speculate the reasons!

Yeah the KO4 pipe does reduce down towards the turbo too.  I think they wanted to increase the pipe diameter gradually to keep the gas speed up?


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline Paradox1

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Re: Cts outlet pipe
« Reply #8 on: November 16, 2016, 12:39:27 pm »
Possibly who knows. remember they put ridiculous time in testing all these parts. i think it would be a limiting factor way above k04 tune though.