A popular modification saw owners of the first GK model removing the air-filter resonator box. The resonator box was located directly in front of the front left hand side wheel, behind the fender. This allowed for a greater airflow to the air filter, gaining a minimal increase of brake horsepower (bhp). Hyundai, seeking cost cuts, adopted this modification for 2004+ models. Hyundai also released a new color for their 2006 Tiburon called Regatta blue, between Tidal Wave blue and Midnight blue, which is Metallic. This color is also available for the 2007 Elantra and Tiburon.