fittings to accommodate air injection manifold add a 0 in front of the part number ... 2243 24 one tube over frame left side 25 this is a tuned equal length shorty ... control devices attached to exhaust manifold on 1977 and later vehicles and is ... 43 fits integral head engine only i.e intakemanifold is part of the head exhaust ... manifold bolts to the bottom not to the side of ... 54 two tubes over frame right side 55 manifold dual kit fits 1971-87 only 56 will not ... particular transmission 82 will not fit castiron powerglide 83 installation ... the crossmember 104 fits cross flow iron duke only 105 hooker muffler #21009 ...