Installed motordyne plenum spacer, now the nismo CAI tube rubs on the sway bar. It makes a knocking noise while driving. I tried to put a rubber grommett in the area, but when the sway bar flexes, the grommett falls out. Any ideas?

 

loosen the cai, twist and readjust it

 

There are a variety of ways to tweak the bar to clear both the upper plenum and hood. Never heard of a intake problem - but same solutions. Plenty of valuable information here.