I am looking to replace my spark plugs, what's the best one to go with?

 

E3s

 

I found the autolite 5143 (I think is the number) -- essentially the stock plugs worked great. They were in almost perfect condition when I changed them for the Xcharger install, and gaps stayed pretty close to original setting after 40,000 miles.

 

+1 on E3's. They cost alot, but they deliver alot too.

 

JIM5.0 and 157dB do you guys have any first hand experience with them? Sears sold them when I worked there and so co workers of mine and I did some research and asked around and didn't ever get any good feedback. In fact if you read reviews for you self at amazon.com you will lots of people complaining about how they believe they have damaged the engine and ECU. apparently the plugs hold a charge and can cause havoc on the electrical system. But i have no first hand experience so take from that what you will. I would love to hear from someone with a mustang's first hand experience with them!

 

Autolite 5143 Copper Cores. Cheap, to the point, get the job done as good as and in most case better then the over hyped and over priced platinum, iridium and especially E3s. I wouldn't put those in my lawn mower much less my Mustang!

 

NicePony has the experience with spark plugs

Don't assume people that higher$$$$$$ means better performance for your application. Too often the assumption is that something just has to be better because you paid more for it - but if it isn't correct for your application then you are throwing money away and may be causing damage.

 

Yep, firsthand, not second hand gossip.
Plugs cannot 'hold a charge' or damage an ECU.
They cannot 'play havoc' on the entire electrical system.
I put the E3s on the test bench with a freq generator
and an O scope. They are crisp and clean with the spark
discharge. No measurable harmonic distortion whatsoever.
Try that with a lawnmower plug and see what ya get...
They almost 'ring' with resonance at about 6800 RPMs
just where you would want them to...

 

It's always been my thought that spark plugs pretty much don't change based on the price you pay or the brand you buy. I bought my iridium's because they'll last 100k miles and I'll never have to buy 'em again! However at the same time I've heard good things about autolite? Do some research, maybe ask a guy in the industry, but from my view you're not going to find a spark plug that stands head and shoulders above the rest

 

Keep in mind, with a "mild" or high performance engine, you'll most likely need to change your plugs more often than the "factory recommended 100,000 miles". Depending on your mods, platinum plugs may not last long and be a waste of money. There's plenty of low-cost plug options for the V6.
I personally ran through the stock plugs in 25K miles (wore out 3 of the electrodes), installed NGK TR6's and ran them for 17K miles with no signs of wear. These plugs are 1 heat range colder for blower use, but nevertheless, they were very good plugs for me.