NGK
Iridium Spark Plugs
For years we searched for the "right"
plug for high HP, high boost applications on our own Zs.
After testing numerous plugs we found the absolute best plug
money can buy. Trying to find an adequate plug colder
than the PFR6B-11B proved to be tough, but these plugs deliver
the best spark around.
We offer these plugs in the heat range of
7,8, and 9.
Our recommendation for choosing the
correct heat range:
Stock Boost Levels up to 15 psi: Stock
Plug PFR6B-11B
"7" Heat Range: Stock Turbos (any boost
level), Sport 500s. 530s, & 600s. Great for street use.
"8" Heat Range: For those who race at
high boost levels and any upgraded turbochargers. Good
for nitrous as well. Great
for street use.
"9" Heat Range: Race use only!
Great for high boost and nitrous use. Not recommended
for daily driving.
All plugs come pre-gapped to .030", no gapping required!
