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hey guys i got a few questions for ya. my gas mileage has been droppin here for a few months and i'm tryin to resolve this problem and maybe even get better mileage. i hear alot of stuff about these E3 diamond fire sparkplugs and i'm wondering if they are all that they are put out to be. i'm also thinking about upgrading my coil packs, wondering if you guys had any insight as to which ones to get, what kinda performance i might see. and even if they are worth my time upgrading. also wondering what other mods i should be doin at the sametime if i'm gonna do the E3's and coil packs. your help would be greatly appreciated fellas.
 

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the hemi's love your standard copper champion spark plugs. as for coil packs i really haven't read anything on here about them
 

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^^^^^^
Listen to this guy! I just put some fancy NGK spark plugs in mine and lost fuel mileage. Not sure the exact issue, but it's appearing like I need to put standard copper champions in.
 

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stick with the stock copper,as for the coil pacs i thought the same thing, but theres some trucks on here pushing lots of hp still using the stock coil pacs.
best first mod for any hemi is a catch can.
 

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Yes dont use the E3 plugs....you might have more problems than you want..like the old saying is be careful what you wish for, you might just get it!...Iridium or plantium plugs (resistor) is the best....I changed out to a K&N air box filter...get your fluids flushed (trans, brakes, P/S system, fuel induction/injection service after you switch out the plugs..I use BG products...and swear by them.....
 
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