whats bad about it, please explane

 

it gives u no back pressure and is bad on the rings or some ****... i dont remember what part it hurts but i know its supposed to be really bad on the engine on a DD

 

im still running the cats and i dont have a a low rpm dead spot so i think iv got enough back presure, besides there realy isnt much differance between running no muffler as aposed to somthing with a straight threw desing such as a cherry bomb muffer

 

it is a myth. i drove my supra for 2 years with no mufflers or cats and had no problems. oh yeah, it had 3.5 inch pipes as well