Increases horsepower at the top end of the RPM band
Ensures and maintains maximum energy supplied to the spark plugs
Reduces incomplete combustion caused by misfire
Eliminates RFI (radio frequency interference) by eliminating the need for a wire set
Easy installation designed to fit the high performance engines
packs are the igniters. The series 1 have separate igniters, where the
series 2 are built in. You should be able to tell by looking at the
existing coil packs. Alternatively you could look up the engine number
with Nissan.