reduced EGT's mainly, i got the cat back installed yesterday, still waiting on the cat delete pipe, i had enough tubing in the kit to remove the cat but would have to cut the fitting on the downpipe and either weld a new flange or make a slip fitting, but if the need to ever put the cat back on arises, ill have that option by going with the test pipe with the stock fitting.
this was the second diesel exhaust ive ever installed, and being that it was for an F250, some of the brackets need to be adjusted as i cut the over the axle pipe a bit to raise the exhaust tubing as high as i could, the tail pipe is currently hanging about 4" too low, but should fix that this next week with a new hanger bracket.