The hose to the brake booster is removed and tucked out of the way, so that the driver side manifold can lift right out. The 10mm bolts on the power steering pump may also need a little loosening. | 
Once again the trusty blowtorch is needed, this time for the EGR. In theory, once heated, the EGR can be unscrewed with a monkey wrench. Unfortunately, it was so well rusted on there that Junior didn't manage to remove it until the manifold came off the car. | 
The driver side manifold lifts straight out once a 9/16 socket removes the bolts. Not all of the bolts were very cooperative, and in fact one of the rusty bolts snapped in half staying half lodged in the cylinder head. Thankfully it happened to be one of the bolt holes that we would not be reusing, as most aftermarket headers use a few bolt holes GM put in heads that are not used with the factory manifolds. |
This is the prime opportunity to remove the, otherwise nearly impossible to reach, spark plugs. We'd be foolish, if not masochistic, not to use this opportunity to change the 94,000-mile set of carbon-encrusted stock plugs. | 
Removing the passenger side header is no easy task, and quite a bit trickier than the driver side. To reach all of the manifold bolts, the alternator needs to be removed via its 13mm bolt and 17mm nut. There is also a 13mm bolt on the bracket itself, and another 10mm bolt on the backside. Don't forget to disconnect the battery first before touching the alternator. | 
The O2 sensor is easier removed prior to the manifold with a 7/8 open end wrench, and may require some fiery persuasion. It is also best to remove the oil dipstick tube via its 10mm bolt. |
A 9/16 socket is needed for the bolt on the tranny dipstick, which will help provide enough play to pry it out of the way in order to reach the back bolt on the manifold for the secondary air injection system. This is a two-man job as seen here, Pedro lends a hand as he is careful not to bend the tube too much as Junior unscrews the 1/2-inch bolt. | 
After the stock passenger side manifold was finally unbolted, the Pacesetter header was slipped into the engine compartment from the bottom (just as the stocker was removed). | 
The bolts were loosely screwed in to hold the header in place while the car was dropped back down on the lift. You can see how tight things are in this area, but the fitment on the header was so precise that it managed to be pretty painless. |