Hi Matt,

There is a deflector for around $5. on ODK ,you'd have to check it fits your muffler .

https://www.outdoorking.com.au/clearance-items/briggs-stratton-deflector-393760-393757-mup3031

I've had mowers where someone has just screwed a bent alloy plate to the muffler to deflect the exhaust.

When one muffler bolt is broken and I can't be bothered drilling the bolt out I just fit the round muffler as the internal
thread is in the exhaust port on these motors.

Cheers
Max.