90MM?

74MM I have fitted already.

I'm unsure how to mate the 90mm to the engine intake. Securing the air intake is another concern.

The other side is that if the engine intake is only 74mm then what benefits will there be to trying to force a 90mm to mate to it?

Things I need to work out; quite new to this side of things - mechanics I'm not new too, but usually following others instructions/steps.