Here is my problem I own a 3W75I, I purchased a pre-owned 3W header and canister muffler which looked unused. I built my 1/3 scale DVII and built the engine mount and firewall to fit this setup. Yesterday on the 15th flight the header broke and now I need to know which replacement part to order.

The schedule: I’d like to get this fixed in less than 2 weeks for a couple shows that are coming up.
The engine is soft mounted, I used the same soft mount setup that was recommended on my Ziroli P47. I know this big single shakes a bit, I could remove the soft mounts and maybe this will help.

The canister muffler is mounted per spec with a soft mount on the weld ring about 1/3 back on the canister.

Does anyone know which 3w header this is? Would it be possible to get a stronger one made from stainless, if so where.
Other options?

Enclosed are a few pictures