Synergy's 100% hand made intakes are your solution for an intake you wont out grow. With most of the CTS V owners moving to the bigger 90mm and 102mm throttle bodies out there, there used to be no intake that could support the air flow needs. So we created that. Our intakes are a true 4.5 inches. What does that mean? It means that even your 102mm throttle bodies is smaller then the intake itself.