plastic reducer for stock boost controller

[JDMSLIK]

So the cars under the knife pretty hard right now. Got the tdo4 and tmic going in, currently replumbing the intake. Just curious, there's a little plastic reducer in the vacuum line I'm thinking of tossing. The reason I ask is cause I worked at a subaru dealership for roughly 7 years. Didn't do very many boost related diagnostics but one of the last ones I saw the tech beside me diagnosed a low boost and we were stumped. Ended up replacing that little reducer and line for kicks (brass on a 04 wrx) and it fixed the problem. I'll admit you guys know a shit load more about boost than most dealerships. Your input would be greatly appreciated. What does that plastic thing do? THx

[JDMSLIK]

so know in the other line i found a little brass reducer?

[darkcrave]

I really dont think its needed, i removed mine when i put my Manual boost controller on.

[Legacy777]

The reducer is there to help improve readability and remove pulsations. I'd suggest leaving it there.