i had a 94 accord EX, i think that is the canadian EX-R, anyway, mine had a catback exhaust and a removed resonator. i could feel it "kick in" at about 3700. somewhere between 3500 and 4000, if i remember correctly. it wasnt so much that you could feel it, like you can feel a turbo kick in, but you just know that its a lil different now that the VTEC is working, the engine is a lil more high pitched, i think. i can really feel it on my EX V6 now, which comes in at about the same place, i believe.