Had a whipple,the better screw,except can't get recertified. They are bada$$. 400 hp less drag on motor,cooler air and will fly even if tuneup is screwed up. Easy to run and never need restriping. You heard of best thing since sliced bread,who needs bread?
A 14-71 hi helix takes long pullbar to turn.A screw turns by hand and you hear the air.
You will not see around or over it. So aim good at starting line.LOL