[akotten]

Originally Posted by m-power-

Ordered them. Gonna try to fit these on xi in January with new turbos, should not be a problem

Let us know how it goes. It would be nice to have another option for us xi owners.

[Dr. G]

Originally Posted by Syndicategt

How much difference does the 3" make over the 2.5" when it will eventually taper down to 2.5" before it meets the mid pipes? I understand the pressure imediately after the wastegates will be less but eventaully it bottlenecks at the tapered section. I know it's been discussed in the past, and 3" pipes have shown more gains, I just don't understand the physics behind this.

*Same goes for intakes and larger chargepipe diameters when the turbo inlets are extremely restrictive to begin with. I'm guessing air would just have to move faster if the pressure is constant.

'

Possible explanation could be as it's hot it takes up more volume, so the 3" tubing accompanies a larger volume and as it cools and compresses down the piping also tapers to 2.5" accordingly. The only problem I see with that is, how much cooling can possibly be done from the beginning to the ending of a downpipe?

Originally Posted by 335coupe2007

did anyone get clarification on if its 3.0 or 2.5 inch?

Visually it definitely looks like a 2.5" design with a larger opening very similar to what CP-E has done.