307365 / 307365 - Application Notes This new front core support for the 350Z chassis is a stronger anchor point connecting the front core support to the main chassis. By adding these additional supports to the 350Z, STILLEN has been able to increase overall chassis rigidity significantly. Not only is this brace extremely functional but looks great as well. Fabricated out of 304 stainless steel and tig welded, these braces offer a truly custom yet clean appearance. Install time is minimal, should be 20 minutes or less.