I just did this mod yesterday. Night and day difference in throttle. Nothing to brag about, but it seems to have been worth while.
P.S. My set up is on my 99 av6 coupe. Cold air intake is also thermal wrapped, and pulls from an aluminum boxed, heat shielded frilter. Passing through an OBX TBI spacer.
put the pipe down.
let me guess, you felt gains with the throttle body spacer too?
...The correct line size is 5/16", or .3125". I discovered this when the trying to use the suggested 1/4" barb hose connector. Wich jiggled loosely in both lines...
let me guess, you felt gains with the throttle body spacer too?