If you'd like to stay OEM, our 1.6T GT N-Lines use NGK IR Spark Plugs. OEM#:18849-08080. They have a gap of .7mm-.8mm per Hyundai's Tech Manual.
Sxth normally has the HKS M40/45XL Spark Plugs, however it looks like they are all sold out. The 45XLs have a Heat Range of 9 (They Run Cooler, which is "better" for Turbocharged vehicles). However the 40XLs are a Heat Range of 8, which is the same as NGK's stock plugs. E3 currently doesn't offer any plugs for our vehicles (I heard really good things about them). I'd stay away from AutoLite or Champion Spark Plugs, but if you could find Bosch or Denso.
Sxth normally has the HKS M40/45XL Spark Plugs, however it looks like they are all sold out. The 45XLs have a Heat Range of 9 (They Run Cooler, which is "better" for Turbocharged vehicles). However the 40XLs are a Heat Range of 8, which is the same as NGK's stock plugs. E3 currently doesn't offer any plugs for our vehicles (I heard really good things about them). I'd stay away from AutoLite or Champion Spark Plugs, but if you could find Bosch or Denso.
