J Tubes (Pair) VW Beetle 1962–1998 VW T2 Split 1962–1967 VW T2 Bay 1600cc 1967–1979Exhaust J Tubes. These replace the heat exchanger as a cheaper alternative. With J Tubes, the van would have no heating produced by the engine, so you would lose your interior heating. SOLD as a PAIR Fits VW Beetles from 1950 onwards; 1200cc and 1500cc T2 Splits from 1962 to 1967 and 1600cc T2 Bays built between 1967 to 1979.