For engines 1500-1600cc
1st cam diffuser diameter-24mm 
2nd cam diffuser diameter 29mm 
Diffuser/auxilary Venturi has been increased, air and fuel jets replaced, acceleration pump performance increased, cold start adjusted.
Makes the engine breathe easier on medium and high revs. Simple installation.
VAZ 2101 21011 21013 2102 2103 2104 2105 2106 2107 RIVA 1500 1600 2108 2109 21099 2110 2111 2112 SAMARA 2121 21213 NIVA