Vtec is great, but a lot of people make it seem like its the greatest thing out there. Honostly, its more like a bolt on. Like if I was to put an aftermarket TB on the car and help it breath a bit better and in turn gaining like 5hp. Vtec is the same. Think of it like an aftermarket head that help get you an extra 30hp (for the integra). And just like every other mod, do you get sucked into your seat when you put a header and exaust on? No. Can you hear it? Yes. Can you feel there's a difference? Yes. But its not gonna be so noticable that your eyeballs get sucked into their sockets.