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Old 04-13-2015 | 02:26 PM
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Default spark plugs
What are the best spark plugs to use in 2002 hp 500
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Old 04-23-2015 | 12:00 PM
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I run AC R42ts in my 500efi's, and they are cheap
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Old 04-23-2015 | 01:25 PM
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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.
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Old 04-23-2015 | 02:40 PM
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I picked up 8 MPH switching to Split-Fires!
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Old 04-23-2015 | 05:14 PM
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Originally Posted by Dave M
I picked up 8 MPH switching to Split-Fires!
Wait till you try the Plasma's.
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Old 04-23-2015 | 08:08 PM
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Originally Posted by SB
Wait till you try the Plasma's.
They only work if you have the magnetic conditioner on your fuel line.
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Old 04-23-2015 | 08:22 PM
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my brother,s daughter,s boyfriend installed a set of e3 plugs in his fountain[hp500] and gained 12 mph!
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Old 04-23-2015 | 10:00 PM
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In case anyone is wondering, the OP's question has been answered, thus the derail.

Originally Posted by Powerquest230
They only work if you have the magnetic conditioner on your fuel line.
I have two vehicles that come in my shop that have these.

Interesting enough, they are both older Toyota Tundra's.
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Old 04-24-2015 | 06:55 AM
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Combine the Splitfires, Magnetic Conditioner, and 104+ Octane Boost and you will not be able to keep drives on your boat.
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Old 04-24-2015 | 08:00 AM
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Originally Posted by Dave M
I picked up 8 MPH switching to Split-Fires!
I picked up 12 mph but i indexed mine
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