Hey thank you for considering us, but it's unfortunate that video exists as it's full of false information and made up numbers.
I can guarantee you no flow data exists which can substantiate said misleading claim. It's like a power claim with no dyno chart for verification. If cross talk of exhaust gases caused a power loss in this manner, someone should report this to Porsche immediately given the design of their tip section!
A cast X-pipe allows for a smooth transition into and out of the X section. The casting of the interior is also smooth, without any protrusions from welds. A proper back purged weld with full penetration will most likely have some material on the backside in the X. I've attached a picture of a non-cast design which shows a common scenario of failure due to stresses and possibly lack of proper welding techniques. We've made a very conscious decision to offer the most durable X solution possible with our customers in mind. We've also been using these X-sections with great success on our full line of Boxster / Cayman exhaust systems which are proven to perform, and warrantied to do so on the track for LIFE.
To be realistic, the effects of any x-pipe would be small to where the any power gains or losses would not be felt. You can expect a smoother exhaust note and as you may have seen we have a wealth of tip options with customization available to have your tips built exactly how you see fit. I'd be happy to take care of you with forum pricing and make you believer.
As always if you have any questions, comments, or concerns - we're always here to help.
-Mike
