GadgetmanNebraska here with a groove on a 2001 F-250 V-10. This pickup picked up some amazing horsepower!! Throtlle response is a lot better and rpm's appear to be lower. Major temperature drops on exhaust temps and CAT. Exhaust temp was 591 on right manifold and went down to 399!!!! CAT went from 420 degrees down to 250 degrees!!!! AMAZING. Customer Art Push said THAT"S NICE! I've got a race car now!!!!