After years of research and thousands invested. What a load of crap. Actually it tool me about 20minutes of high school geometry and $20.
Like me a couple of guys were a bit concerned about the way the VW racing CAI kit deals with the turbo bypass hose. I gave it more thought and decided it would be a far better solution to use the existing oval shape OEM corrugated turbo inlet pipe.
After some calculations I would out that even though the pipe WA oval (ellipse) in shape I was sure a round silicone reducer could be made to fit. To use the OEM pipe I needed a silicone reducer of 80mm to 70mm.
This is exactly what was needed and is available from Melbourne $14.50 delivered.
You also need a 90mm hose clamp about $4.
The Photos below show the DIY.
I think this is a heaps better solution than the expensive hard to fit 90 degree silicone elbow. Also it means you don't need to fiddle removing that shitty spring clip on the turbo. If this was the way the kit was designed in the first place I am sure a straight reducer is heaps cheaper than a specially made elbow plus a machined aluminum fitting.
As luck would have it the ebay reducer listed above is only 3 ply making it very flexible and easily fits over the rubber ring taking the oval shape without distortion. It is also the perfect length.
In this photo I used a 102mm hose clamp because I could not find a 90mm one but 90mm will be a perfect fit.
You can also see I have used a cable tie to stop the stainless steel spring clips from flapping round. you can remove these clips altogether but i like to be able to returns things to stock.
For an extra $20 I think this mods makes this kit heaps safer, much easier to install and all round make a much more attractive CAI.