The 1969 Nova dual exhaust system consisted of 2 1/4″ head pipes on both the big block and the small block cars. The small block cars had the pipes necked down to 2″ at the manifold while the big blocks were expanded up to 2 1/2″. Both systems used 2 1/4″ over the axle pipes and tail pipes ending behind the rear wheels resonators may have been used on the small block cars.. Our system comes reproduced from originals and includes the correct head pipes with wrinkle bends, correct over the axle pipes, correct tail pipes with oval shaped angle cut, extensions, donuts, correct rounded bottom clamps, and guillotine clamps, tail pipe hangers, installation instructions diagrams and sealant. Our reproduction muffler hangers are available with one of our kits and once again we are the only company reproducing this particular piece. Ask about our concourse show package.if original is not good enough.