I have some customers with N/A applications most of them for road racing set up.Don't have any dyno sheets for N/A but as far as my customers review all of them report back that they were getting a better response coming out the corners and more torque at top end.As far as hydro or mech lifters the response with the mech lifters was a little better than the ones with hydro lifters.If you have any questions you could always call me at 407-436-4832