We are now offering a drop-in nitride coated valve to our product lineup. They offer higher airflow, are far more durable that a standard valve and can hold up to higher engine temps associated with high boost levels. These are available in a drop-in size for stock heads as well as +1mm over. Price is $248 for either set. Check out the website, jacksonautomachine.com or call us at 410-859-3269 for more info!