Big Power Gains For Your LS1

The bolts that hold the front H-pipe bracket to the bellhousing are the next to go. When they're removed, the front of the H-pipe will drop down on the manifold nuts, which is the reason they should be loosened, but not removed.

Two bolts hold the assembly to the rear hanger. When these are removed, the only fasteners holding the H-pipe in place are the nuts on the exhaust-manifold studs. With the manifold nuts loosened, the rear of the H-pipe may be lowered onto the ground or a support. Then remove the nuts on the manifold studs, lower the H-pipe/converter assembly, and slide it out from beneath the car. Since the H-pipe is over 6 feet long, it's a good idea to have an assistant help with its removal.

$^p<$E?re ready to tackle exhaust manifold removal. The driver side is the more complicated of the two because components like the steering shaft are in the way. Remove the bolt that holds the shaft to the steering box and slide the shaft out of the way.

Then remove the coil covers, alternator, and the bolts that hold the coil assembly to the valve cover.

Once all the bolts are unbolted and the connectors disconnected, the coil assembly may be lifted out of the way.

Next the fuel line can be disconnected; but before removing this clip, make sure pressure within the system has been bled off. It's also advisable to loosen the gas cap to relieve any pressure that may have built up in the tank. Leave the cap just loose enough to allow pressure to bleed off, until the gas line is reconnected.