really?!my Quicktime(and all the other size QTs i've used)2.5" actually has an opening of about 2".the 3" model has about a 2.5" opening.
i've been trying to find a "sliding door" style cutout to avoid some of the the problems associated with the butterfly valve type cutouts.i've seen people talk about this kind of cutout,but can't find any good info.when i make a new downpipe,i want something that has a true 3" opening,and functions beter than what i have now.
Chris