Finally ordered a new SCT turner and 4-lb pulley for my otherwise stock 2003 Lightning from PowerSurge Performance. They recommended that I change the plugs when I install the pulley, suggesting either TR6 or IT20 plugs (not looking forward to this part of the install). She said I may experience some minor twitchiness with the TR6 plugs in street driving, but apparently there is a significant price difference between the two ($20/set for TR6s versus $80 or 90/set). This is strictly a street driven truck that mostly goes back and forth to work once or twice a week. Are the TR6 plugs OK or do I need to spend the extra money for the IT20 plugs?

Thanks

Dan

 

The TR6s will be fine.

I have a new set of IT24s in mine with a 5lb pulley. IT22s would have been OK for me.

Dan

 

I would also suggest installing a cold air intake such as a k&n, if you haven't already.

 

TR6's
They run great ( the idle can be a tad rough at times ) and you can't beat the price...

 

OK - sounds like TR6s it is.

Thanks

Dan