would something like this be suitable as a temporary measure whilst in the testing station -

https://www.merlinmotorsport.co.uk/p/bs-approved-silencer-baffle-kit-excnrk

not sure on your set-up,but if the pipes are straight, these might be made to fit....?

James

Aero8 , Series 1 - Boston Green
Mercedes EQC 400 AMG
Smart Brabus Convertible
Honda Monkey Z125