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Discussion Starter #1
what are you guys using for plugs? I have been running ar473's in mine and just looking to see which ones you use.
Or recommendations.
5.4 4v navigator
 

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TURBOBULLET.COM BITCHES!
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NGK R5671A-9.. A lotta people run NGK's.
 

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BR7EF. Work great, ~ 1000hp. I would not run a projected tip plug in any higher power car.
 

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Lower power say under 5~600 NGK TR6 Over 600 BR7EF Been running the BR7EF's for years and love them; Ive got a set of Autolites in the tool box just havnt got around to trying them.... hard to beat what works great.
 
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