On the 79-84 truck 2bbl intergrated head the dual exhaust manifold used 2 inch pipes for about 18 inches than dumped into a single 2 1/2 pipe then a cat then a 2 1/2 exhaust pipe, single muffler (oddly enough the same muffler used in 1960s full size V8 chevys) and a 2 inch tailpipe. On pickup trucks the 2 short pipes are different lengths to make the distance to the "Y" The same. I have one of these pipes and can post a picture if you want. It WILL NOT clear the sub frame in a nova/camaro. Hangs down way too low and pipe would hit the ground. When used in a van the "Y" pipe is different. Looks like it MIGHT clear in a car.NAPA's web site has pictures of both. On the color of engines I think we are both right My 77 Z28 camaro was blue yet I have seen unpainted 77 novas with orange. Jay 6155
