Must you remove the noise pipe? What if someone plans on using it for a DV relocation in the future?
And is there going to be any way to fit the tubing through the stock cutout?
Yes, the OEM noise pipe must be removed. It's location/proximity to the passenger side headlight will simply not allow enough room for the tank. The earlier FSI motor has a differently shaped noise pipe so this was not an issue and this same tank would fit just fine with it, but VW decided to change the noise pipe for the TSI motor and this particular tank will simply not fit.
Rather completely redesign a new smaller tank for the TSI motor, which is still within the same engine bay as a MK5 with an FSI motor, and since most people want the largest possible tank they can get anyway, we chose to remove the noise pipe.
We are looking into potentially offering our own valve relocation setup soon that will utilize a flexible return hose that can more easily be routed out of the way rather than a rigid hard pipe that is takes up otherwise usable space.
Right now, the supplied tubing will not extend through the cutout in the stock cover. You will need to make a small relief hole in the cover or use your own supplied longer tubing.