Whatever parts warranty there may be is provided by the parts manufacturer, such as Comptech; check on their website. (Comptech's is here.) Any warranty for the installation depends on the installer. For information on the effect of the installation of aftermarket parts on any warranty for the car, click here.
In general, the installation of aftermarket parts represents a risk, particularly for major modifications; in case of problems, it's not uncommon for each vendor to blame something or someone else ("finger pointing"). If you're really worried about having to pay for major problems resulting from the installation of forced induction, you probably shouldn't go that route.
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