Synergy's 100% hand made intakes are your solution for an intake you wont out grow. With most of the ZR1 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. This intake has already been used and proven in some of the ZR1's around making 900-1000HP ranges. There is one thing to keep in mind with this intake, it was designed around using the LPE snout, so running this intake also means you must run the LPE front snout for correct location.