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Nos?

DUDE!!!!!!!!!!!

Just f*cking search. The answers to your questions are all available on the forums and have been asked many times before. Nobody can tell you your car is gonna be fine, because we don't know what condition it is in. I wouldn't start spraying nitrous on an old V6 tour, but that is just me.

Search, find answers to your basic questions, and get that sh*t installed at your local jiffy lube along with a $13.99 oil change. Make sure you get two of the big bottles (you might have to overnight ship them from japan).
 
they run different heat ranges. the number code on teh plug is the heat range.

example

NGK's part number for a copper core plug (standard plug) is TR6 (contour stocker)

the 3L is recommended to run a TR55

in my car i believe i ran TR5 plugs (would be 1 step colder than a stock 2.5L)

Correction:

TR5 is the standard heat range for the Contour. TR6 is 1 step colder.
 
Isnt the TR55 1 step and the TR6 is 2 steps?

Either way, run TR6's

No. TR5 and TR55 are stock heat range.

STOCK HEAT RANGE
Copper Plug
Part # / Stock #

TR5 / 2238
TR55 / 3951

Platnium Plug
Part# / Stock #

TR5GP / 3186
TR55GP / 3403

Iridium Plug
Part# / Stock#

TR55IX / 7164
TR5IX / 7397

- 1 DEGREE FROM STOCK

Copper
Part# / Stock#

TR6 / 4177
BR6EF / 3177

Iridium
Part# / Stock#

TR6IX / 3689
ITR6F-13 / 4477

-2 DEGREE FROM STOCK

Copper
Part# / Stock #

BP7EFS / 3526
BR7EF / 3346
BR7EFS / 1094

Platnium
Part# / Stock #

BP7EFVX / 3344

Iridium
Part# / Stock #

TR7IX / 3690
 
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