Ummm what header break in procedure? I guess I missed that part. What is it? I'm runnin 2 1/2" exhaust dumped in front of the axle. What do you mean the average joe is going to stick with the stock 1 5/8"? Is stock exhaust tubing 1 5/8"? I thought our primary tubes were 1 5/8". I did some reading on exhaust sizes and from what it said with my motor & mods it would be a waste of time & money to run 3" pipe. I like the looks of these headers & I'm sure they make some extra power. I'm just pissed off at em because of the problems I've had with them.