Just so you know, the stock exhaust manifolds would not fit. So, we got a set of the new Hedman 3/4 length for LS. When I was a kid, Hedman was not so great. But I have too tell you, these are NICE. 3/8" flanges, 16 gauge tubing, and nice collectors. Here's the best part, they fit GREAT!
I can tell we'll be using a lot of these in the future.