HEAVY HITTER: Using the JDM STi projector lens as our performance benchmark for 3" Koito Bi-xenon Projectors, we were able to bring that hard-to-find performance to the masses with Morimoto 100% optically clear STi-R lenses. HARD TO BEAT: When using these Morimoto projector lenses on the family of 27mm focus Koito bi-xenon projectors listed in the compatibility section below - the aesthetic appeal and raw performance of your retrofit will be hard to beat. JAP-SPEC: It is very common for many modern vehicles with 2.5" factory projectors to come with the projector that's compatible with the STi-R Clear Lens. If you're unsure, feel free to ask! (H7, H11, D2S, and D4S are all common bulb sizes in these projectors) NO BRAINER: Adding the STi-R Clear Lens to your OEM headlights or projector retrofit with OEM projectors should be a "no-brainer". Not only are they an inexpensive upgrade, but these Morimoto projector lenses allow the projectors to perform to their maximum potential in every aspect. SIZE MATTERS: When picking out a pair of clear lenses, such as the STi-R Clear Lens, it's not about which model is "best" - it's about compatibility. The diameter AND focus height of the lens are both very important.