I am planning on upgrading the VTG turbos to 65-68mm turbos in near future,
I have 74mm plenum laying around right now,
And I am NOT planning on getting 82mm plenum/gt3 t-body in future,

Is 74mm IPD plenum better than stock plenum with upgrade turbos?

Let me know your opinions!

Thanks!

 

Depends who you ask. You probably can see some early gains on a carefully controlled dyno comparison but I suspect not very noticeable by the seat of the pants. It certainly won't hurt but whether or not it is worth the investment is a whole different debate.