I have a 03 TL with 36K miles. Will I see a lift in power and performance if I switch out stock plugs to NGK Iridium's or should I wait?

 

No. Wait

 

I don't think you will get much more lift in power and performance at all .
I will stay with the OEM sparks.....

 

Thanks guys

 

i put them on. makes no difference whatsoever... no probs though. had denso iridiums and after 27-30k miles i could feel them strugglin 'cuase the car started to feel sluggish all of the sudden (SHORT LIFE SPAN) so i put some ngk IXs

 

That's because Denso Iridiums, at the least the most common ones, contain Iridium center electrodes but conventional ground electrodes.

The NGK 6994 Iridiums contain an Iridium center w/platinum pad on the ground electrode for maximum longevity/durability in apps where there's firing from the ground to center electrode, not sure if TL is one of them, but its possible.

The plugs w/Iridium centers and platinum pads on the ground electrodes will last virtually forever unless there's some extreme fouling.

 

I don't think the NGK 6994 Iridiums is available for our TL 2gen ...................

 

You can use #2477 NGK Iridium IX for 00-'03 TL-P.

 

Yup, I have them. They work great