I've heard that the B18C1 is one of the "quieter" (I don't even know if that's a word) VTEC engagements. My boss has a VTEC Civic and everything is louder on his car, his intake is louder, when it hits VTEC you can really hear it pull. My intake isn't really that loud and I can barely tell when my car hits VTEC. I can only feel it not hear it.