Mishimoto Subaru WRX 2015-2021 Performance Black Top-Mount Intercooler and Polished Charge-Pipe Kit - MMTMIC-WRX-15PBK Cold Air Intakes they are a 19 Hex

they are a 19 Hex thin-wall lug nut that fits in small bolt holes of most modern aftermarket wheels

870 Viscosity at 100°C

The dramatic firewall flex is the source of this performance flaw in Subaru's that we came to solve

you'll get maximum performance

Compatible with most intercooler and intercooler piping kits

Mishimoto Subaru WRX 2015-2021 Performance Black Top-Mount Intercooler and Polished Charge-Pipe Kit - MMTMIC-WRX-15PBK Cold Air Intakes they are a 19 HexPRODUCT FEATURES Direct fit for the 2015 2021 Subaru WRX Designed for optimal performance on highly modified vehicles using stage 2+ tuning Power gains of up to 15 whp and 8 wtq on performance tune 35F temperature drop compared to stock intercooler on performance tune 100% aluminum construction with durable cast end tanks TIG welded to a highly efficient bar and plate core Mandrel bent aluminum Mishimoto charge pipe included to increase flow