you might want to give a shot at a thin bead of butyl tape around that intercooler pipe neck, and then put the coupler over that. that stuff is impervious to temp changes (its used to seal panels and trim on RVs) and malleable but not really as goopy as a putty. sticky too. i think you can pick up a roll pretty cheap, may be worth a shot to fill the gaps.
2010 Civic Si
2019 4Runner TRD Off-Road
--------------------------
Past: 03 Xterra SE 4x4 | 05 Impreza 2.5RS | 99.5 A4 Quattro 1.8T | 01 Accord EX | 90 Maxima GXE | 96 Explorer XLT
2019 4Runner TRD Off-Road
--------------------------
Past: 03 Xterra SE 4x4 | 05 Impreza 2.5RS | 99.5 A4 Quattro 1.8T | 01 Accord EX | 90 Maxima GXE | 96 Explorer XLT