B6 - Exhaust Manifold Restriction
^ Remove the exhaust manifold(s). Inspect the ports for casting flash by dropping a length of chain into each port.NOTE: Do not use a wire or lamp to check ports. The restriction may be large enough for them to pass through but small enough to cause excessive back pressure at high engine rpm.
^ Is a restriction present?
YES -- Remove casting flash. If flash cannot be removed, replace exhaust manifold(s).
NO -- Refer to lack of power.