JDB1981

iTrader: (1)

What are the best spark plugs to use in 2002 hp 500

Strip Poker 388

iTrader: (6)

I run AC R42ts in my 500efi's, and they are cheap

CIG3

I like NGK R5674-7 but AC R42TS is a good plug. If your going to use the AC use the MR42TS as it is coated and won't rust up over the season.

Dave M

I picked up 8 MPH switching to Split-Fires!

SB

iTrader: (1)

Wait till you try the Plasma's.

Powerquest230

They only work if you have the magnetic conditioner on your fuel line.

mike tkach

iTrader: (3)

my brother,s daughter,s boyfriend installed a set of e3 plugs in his fountain[hp500] and gained 12 mph!

SB

iTrader: (1)

In case anyone is wondering, the OP's question has been answered, thus the derail.

I have two vehicles that come in my shop that have these.

Interesting enough, they are both older Toyota Tundra's.

VoodooRob

Combine the Splitfires, Magnetic Conditioner, and 104+ Octane Boost and you will not be able to keep drives on your boat.

iliveonanisland

I picked up 12 mph but i indexed mine