Stainless Works Chevy Silverado/GMC Sierra 3/4 Ton 2004-07 Headers - Manual (Page 2)

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10. Loosen nuts on studs and remove both manifolds. (8 - 13 mm nuts on each side).
11. Mark the location of the steering shaft and remove it. (1 – 15 mm bolt).
INSTALLATION
1. Cut both leadpipes per the pictures below. Cut the passenger side to 26” long
from the rear flange, cut the driver side leadpipe to 9” from the outside edge of
the leadpipe. Deburr the ID’s of both pipes prior to reassembly.
2. Install 8” long O2 extensions on each of the O2 sensor wires.