For more than 45 years, Air Flow Research has been commited to performance and continues to offer improvements on manufacturing technology, complex dyno testing, and proprietary flow testing methods. They have defined technological leadership in cylinder head manufacturing and flow dynamics which has enabled them to outflow and out horsepower everything in their league. The secret to increasing horsepower and performance lies in the cylinder head. Only the most powerful street machines and fastest racecars use Air Flow Research's cylinder heads!