heffror

Sorry if this has been asked before, but I haven't seen it thru the search, so here goes. I have a 98 GS4 with 89K+ miles, getting ready for 90K change. I need to change the plugs, but I am not sure if the factory used platinum or Iridium plugs? Any help would be appreciated.

Thanks
Bob

DaveGS4

iTrader: (2)

OEM is Denso Iridium plugs

heffror

thanks much

rominl

iTrader: (4)

maybe you can try the tq master plugs too

OsideGs4

The stock plugs for a 98 are ngk iridium ....which i believe in 2001 switched to Denso iridium. I would stay away from torque master's judging by my personal experiences with them in other cars .... but that is just my opinion.

rominl

iTrader: (4)

what problem did you have?

i have tq master, together with a lot of other members here in norcal, and we are all doing fine so far. would love to hear your stories

OsideGs4

Ive never actualy tried them in my Gs4. I Used them in my Supra with no signifigent HP increase and a peace broke off nearly damaging my valve and piston.Way too hot of a plug to run forced induction.IMO , I think a plug with a smaller, very concentrated spark, is more effective. I'm happy for all those who they work great for, I must have got some faulty ones. But I'm sure the quality control can not be as good as NGK or Denso. Not really worth the 5 extra HP to me. There are many more mods that alleviate exhaust or add air flow which is also good for the motor.