basically on an sr20 car a meghan manifold doesn't make the car sound any different than a stock one, if you mean like the muffler's sound, it sounds like every other n1 style muffler honestly, really the change in sound is due to the type of motor it is. i will say however that i put an n1 knock off on my rb20 car and that shit sounds good, but i'd rather have a 3" magnaflow because it's quiet as hell, so all you hear is the turbo spooling. to answer your question though, i can't hear any significant difference between an hks muffler and a meghan muffler, but you WILL notice a difference in how much money you have left over. as far as a meghan exhaust manifold versus a stock one, there's no significant change in how the car sounds.