I've done a good amount of header installs
2 sets of TOG's. IMO the worst to install because they want the dipstick messed with and that rear crossover flange bolting is a PITA for one person.
3 sets of SD's Overall if you get different clamps, reuse stock gaskets, switch flex and plan around the O2 hitting the firewall/tunnel edge, I like these headers.
1 set of ZZP's Not a bad install, didn't like the bend that needs to go on the EGR tube due to how thin these tubes are and the back one that gets bent is the integral one to the pedestal. Break it and you are picking up another EGR pedestal. Actually left the Wizzaire intake on the car during this install.
3 sets of SLP's By far my favorite to install. They slide right in for the most part and have great clamps as part of the install kit. Fitment is great. Too bad the flex needs to be swapped out before install.
1 set of Pacesetters. Did these on a 4T60 toting 96 Riviera. Not a bad install as the owner had the best sleeve clamps he could buy with the goop inside of them. Two downfalls were the trans case (4T60 is slightly different) and they really do need to be welded.
