Yes and they take the time to index their plugs and all to. How many here do that. Not many. Because it wouldn't make jack difference to our stock engines. The plus 4 concept with the multiple electrodes is a marketing gimich. Electricity will only follow the path of lowest resistance, go ot one electrode when it fires. The other 3 just sit there.

 

Put the Superchip back in AND WOW! The combination of new plugs and the Superchip is amazing. Feels like a new engine/truck. LOTS of power....

I've had the chip out for probably 6 months due to gas prices.

Going to the beach, need the chips power for heavy load and beach driving.

 

Rand ::

The fuel rails do not have to be removed, but if it helped you than by all means do it. All the help you can get changing these plugs would be great.