Lethal_Ws6

iTrader: (13)

ive got like 9-10k on my NGK TR55's .. not driven too hard on..

How so often should i change ??

Gearhead1

I was always under the impression that they should be changed at about 25K.

LS144

iTrader: (7)

Depends on your mods. Nitrous is harder on plugs and wires than Natural aspiration.

Lethal_Ws6

iTrader: (13)

No bottle on this car yet.. just the mods in the sig, Okay just checking to see how so often ..

92SilverSHO

iTrader: (3)

if your a hard driver, maybe check them at 15k miles, they are only copper plugs, not meant to go huge amount of time in between changes like a platinum or such.

cantdrv65

iTrader: (3)

Never. I run Iridium TR-6s...

SiL3NtXWS6

iTrader: (17)

about every 1-2k . tr6's

PREDATOR-Z

If NA with normal CR, but fairly daily use, it is good to check them once a year or 15k to adjust gap, or check for any wear.

Patman

I used to do them every 6 months, which worked out to about every 8-10k, but I've gone a bit longer on my current set of TR55s (copper ones too). I've currently got over 13k on mine, and they were last done about ten months ago. The idle is still nice and smooth, which is one of the reasons I haven't bothered to change them yet.