Lingenfelter L320030709 Lingenfelter CTS-V Intercooler Radiator Kit 2009-13 v1.1 - Manual (Page 11)

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25. Using a 10 mm socket, remove the four (4)
bolts that secure the intercooler radiator to
the front of the A/C condenser.
26. Remove the stock intercooler radiator from
the vehicle. Be careful not to contact the
A/C condenser core as this can damage the
fins and affect cooling.
27. Hold the LPE CTS-V intercooler radiator
(PN: XX03277-0007) up to the impact bar
and center it. The mounting tabs should
be resting against the OEM bracket that is
welded to the bottom of the impact bar.
Optional - place cardboard on the front
of the intercooler radiator to protect the
heat exchanger fins during the installation
process.
28. Using a scribe or marker pen and the new
intercooler radiator as a template, mark the
location of the four (4) holes that will need to
be drilled into the bumper beam/impact bar.