This mod adds VTEC Engines and Sound to the Ibishu 200BX, Covet, Old Pessima, and the Hirochi Sunburst. To get the sounds, you must select the "VTEC" engine in the parts selector. Note: The VTEC engines are exactly the same power-wise to their non VTEC counterparts. This mod is purely for the sound. The VTEC kicks in at 6,000 RPM.
Old Pessima Engine:
Here are some videos showcasing the sound. To get this sound, I combined the low RPM sounds from the regular I4 engines with the high RPM sounds from the Cherrier FCV, since I always thought the FCV I4 engines sounded like a Honda I4 after VTEC kicked in.