New dogbone and mounts .... rattle?

[bakertom91]

Just fitted a new rear exhaust rubber (powerflex) and a new doggone upfront (again powerflex). All went well until I got her off the ramp and started her up ... Huge rattlingrattling on idle and revs.
Reckon it's just a heatshield issue or could the mounts be too stiff?

Pictures to follow. Any helpwould be awesome.