Annoyingly I didn't spot the centre line wiggled near the bottom, I kept correcting it earlier on but I guess each adjustment on the sides threw it out again.
It's in with mould release so hopefully I can just trim the sides down, bond it on and then get this sucker painted finally!
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2015 435i - 401whp
Scorpion catless dp, VRSF 6.5" HD FMIC, MST V2 inlet, NGK 97506, MHD Stage 2+ 102, xHP Stage 3, M Performance Exhaust (modified for valved straight thru)