all i have to say is that if you are debating on getting spintech prostreets i would just go ahead and get them. it sounds exactly the same at idle as my one chambers did but has an awesome smooth roar to it. i will never use another muffler on a mustang. ive got the tail pipes on it for now and i cant decide if i want to keep them or take them off and go with dumps. oh well, sounds awesome to me. i might be able to get a sound clip this weekend, but i cant make any promises.