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If you have a hemi, the piping is 3", but if you have the 4.7, the piping is 2.5", but I'd imagine you can get the 2.5" cutout to fit on the 3" piping. I'm getting rid of it because it doesn't even look like I'll have room to put it on unless I extend my piping. It's too tight of a fit for comfort and I don't have time to go out and buy piping and get it installed right now.