does anyone know any sites that show ads for used exhaust systems? I dont want a modified one at all... i need to pass the smog and for some reason(i dont know when or how) my cat was bashed in and my muffler is going to ****... and thats the reason i cannot pass smog... im having trouble finding a stock exhaust for a 1990 honda civic si HB... naturally im assuming the 89-91's exhausts will work. Can i get some help?