i got my exhaust and test pipes put on about a week ago and today i noticed that when i start my car it kinda sounds deeper. any input people why this might be? i bought the exhaust used and previous owner said its had about 10k on it. There is no leaks or cracks either. when im driving i still hear the same sound as i first did just a little less rasp i guess but only thing different is startup.

 

^^

 

any1?