time to tune up the tl. what type of spark plugs would you guys suggest?

 

You should really just go with the OEM NGK plugs. There has been studies done that the so called "performance" spark plugs don't do much. If you want to upgrade, I would stick with the Bosch Platinums or the Denso Iridiums. They are a little bit more expensive though...

 

i have denso iridium , ive had them for almost a year, they supposedly give you HP gains , i dont know but they are decent