Digging up from the grave here... I see several of you have gone 3" to 2.5". Just curious the general thoughts on fit here. I'm assuming that's outside diameter. Thanks!
I did 3 to 2.75. I just re used the rubber ring seal that comes off the stock intake tube where it clamps to the turbo. Probably 2.25 would have been best but i jumped the gun...
However it seems to fit and work great. Hope that helps...