Wastegate housing/down pipe gasket

[MONSTER GN]

Just looking for recommendations for a good quality wastegate housing gasket. discovered I have a minor leak on mine just a bit ago. Is the standard copper crush gasket good enough? provided mating surfaces arent warped obviously.

 

[THensley]

if it was mine, I would tap a sheet of 220 sandpaper on a sheet of glass sand it flat and reassemble ,no gasket asper OE

 

[dynoman]

Get a new 12" bastard file and sweep across the whole surface in one stroke . You'll see the high or low spots . Keep the file clean and file pushing away only , not back & forth . After you have it flat , smooth it with sandpaper as stated by THensley above .
www.amazon.com/Nicholson-File-Bastard-305mm-21842NN/dp/B07YD61TWJ/ref