I will be getting a set of E3 plugs for my Kona Blue Convertible Mustang. I want to know if replacing the stock plugs with the E3 would make a difference. I hate to take out good plugs. But would consider it if it upgrades my Horsepower

 

I have personally never used the E3 plugs, but I have heard nothing good about using them on the other car forums I am on.

The engine is designed using a factory type plug, I would stick with them.

Just my .02 cents.

 

I have good results with E3 on my 2000 but my new Mustang...2010...still has the stock plugs and I will keep the stock in. The one thing I want to avoid is an error code. I am looking for cheap improvements. One thing I did improved the running of the engine was to put those plastic covers on all exposed plugs. I went through what was provided but what an improvement. There is a little of the plug visible at the coil. It runs new. I did put a throttle body spacer and a K&N air filter in and it really helped as well. Thanks