Did a little research on Z28 exhaust:
42566 y pipe 67.99
21598 muffler 42.99 each.
43744 and 43745 are 24.79 each
43662 39.79
43663 33.99
There are other pipes listed for "earler" versions of this system at about the same price. The 21907 muffler that you have posted about is the stock 1 pipe in and 2 pipe out for Camaros and Novas of that era. When the Z28 came back out in 1977, I bought one. ( I was only 2 yrs old at the time) This exhaust system was the only real change to the engine, the rest of the engine was stock LM1. The exhaust added ~20 hp over the system that you posted parts for. At the time I took 2 stock exhaust pipes from a Chevelle and ran them from the manifolds to the mufflers,getting rid of both y pipes and the converter. Believe it or not they fit perfectly and I ended up with a true dual exhaust system. I would recomend that you buy the Z28 system starting at the y pipe and have the shop make you a 1 piece 2 1/2 pipe to crossover and hook up to the y pipe. The shop may even be able to get the pipes cheaper than you can. At the very least get the y pipe and go from there. I have been told that the 292 manifold outlet is in the same place as our 1bbl intergrated head. If someone could verify this (TLowe?) then everything would bolt up when the head was changed to non intergrated. Jay 6155
