New Plugs
#5
11 is the colder plug...i.e higher the number, colder the plug.
I would say unless your car is HEAVILY modded, you will be just fine with the stock plugs (NGK BUR7EQ's leading, and BUR9EQ's trailing).
Slighty modded to modded cars are usually fine with BUR9EQ's in all four holes. Cars running 400+whp have been fine with 9's in all four holes.
Just remember, colder plugs tend to foul easier.
I would say unless your car is HEAVILY modded, you will be just fine with the stock plugs (NGK BUR7EQ's leading, and BUR9EQ's trailing).
Slighty modded to modded cars are usually fine with BUR9EQ's in all four holes. Cars running 400+whp have been fine with 9's in all four holes.
Just remember, colder plugs tend to foul easier.
#7
#9
I have the ngk BUR9EQ's at all four , they work great, but if your car tends to flood easily they do foul pretty quick. My car was running very rich and it would flood easy, i fouled a set within about 2000 miles.
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