What do people think of this pipe? It is supplied with the kit, but as you can see it is single walled. It is spot welded at the seem and when in the fuz has quite a lot of clearance from the sides of the fuz.

...note it doesnt have a funnel at the turbine end.

Should I bite the bullet and order a custom made double walled pipe, or is a dual walled pipe no less likely to fail?