Tell me mate Have you had any problems from that install at all? I ask because of the location of the cuts and joint of the replacement pipe, its right on the bends of the original and from your picture looks to over run and therefore create a large gap, not a problem in itself if properly welded etc but not ideal. But if thats the case how could they have done such a good weld? The originals dont look like they have been off the car so how did they do a good and full weld joint fully around the pipe while on the car.

The sceptic in me says if thats the case they have used a GumGum or the like to make up for poor welding which wont last long. The sceptically side of me says that may be more evidential from over use of the strut and supports on the X-Pipe itself maybe there to support poor welding joints etc. In itself not a issue a bit over kill to be honest but not to be criticised in itself unless you also consider what you paid.

I am not trying to slag off your install I am just saying in my experience of having bespoke exhausts made for me that would worry me. And it might be worth checking it again, there are many ways of doing it, or even asking someone else to. Its only MHO though so please dont take offense.