![BIGVALVE HighResponsekit](https://www.naprec.co.jp/docs/wp-content/themes/naprec/images/hrk_logo.png)
Set yourself apart from the rest with the BIGVALVE High-Response Kit, the flagship model for NAPREC. Engines equipped with these precision custom-made parts, which create the BIGVALVE cylinder head, are sure to see a dramatic improvement in overall performance. These kits are also being used in various races, such as drag racing and the D1 Grand Prix.