Tough call. You will know it's there but unless somebody climbs underneath, no-one will ever see it. You could send it back and exchange it for another one. Sometimes cheaper isn't better. Factory resonator:
[FOR SALE] - 273 Commando resonator
Here's a thread about quality you experienced. See post #3.
1965 NOS Formula S Muffler/Resonator for sale on Ebay
