Downpipe questions.

[Slow Motion]

Has anyone heard of around 30whp gains from switching from a 3" downpipe to a 3.5" downpipe?

I am thinking of trying this on a boosted VH45DE and I just heard that mainly supra and some others have done this.

[R32Dragon]

30whp gains from a 1/2" increase in downpipe diameter? Doesnt ring true to me...but ive never boosted a Nissan V8... If gains are to be had, I dont think they will be that high at all unless power output is that of built 2JZ porportions.

[Slow Motion]

I really didn't think so, but I was conversing with a couple of ppl in FL who gave me the info...I said it might have been of lesser numbers but they insisted.