Just saw the post, by flange do you mean the flange that gets bolted onto the engine???? If so I actually used the gasket as a template and cut one out.
Your exhaust looks like it could get broke off easily from aggresive riding??
Yes, I am a Go-Karter!
Buying a "fast" coyote race kart....... $3750
Buying food & drink for your crew.... $2500
Bringing it to the company picnic...... $Priceless!