Can anyone recommend an after market engine mount set? I’ve looked at Powerflex

These are available from EBay.
My lovely Clio has an aftermarket Miltek exhaust which knocks between first and second and on start up . It’s not too bad over 30mph and higher gears but it’s annoying me.
I’ve tried a stainless weld between the back boxes but it’s not improved. The exhaust specialist suggested engine mounts may need changing as the engine/gearbox is rocking too much?
Any ideas? Any experience of aftermarket engine mounts?

These are available from EBay.
My lovely Clio has an aftermarket Miltek exhaust which knocks between first and second and on start up . It’s not too bad over 30mph and higher gears but it’s annoying me.
I’ve tried a stainless weld between the back boxes but it’s not improved. The exhaust specialist suggested engine mounts may need changing as the engine/gearbox is rocking too much?
Any ideas? Any experience of aftermarket engine mounts?