I have a 08 RCSB 4x4 with a 4.7L. there are allot of kits for the 5.7 Hemi but hardly any for the 4.7. Will the Hemi cat-back exhaust fit on a 4.7?

The pipe looks to be 3" from the Y and 3" out of the muffler.

 

Hmmm idk man good question. I have 2 1/2 in and 2 1/2 out dumped and it seems a lil raspy on my 4.7. I wonder if that is too open??? Let the masters handle it

 

Honestly, most kits are highly overpriced. Find a muffler you like, and figure out what type of tips you want, and go to your local exhaust shop. My catback cost me $280 for parts and installation, including the muffler and two silverline tips. Kits aren't worth the money.

But to answer your question, it would probably fit. The pipe coming off the collector's is 3" in diameter, and even if it isn't a direct fit, any exhaust shop can adapt it easily enough.