i have an LB7 and i cut the cat out today and got a piece welded in...i still have the stock muffler...my question is will it be ne louder..i hear a deeper tone from the tailpipe...my question being does the stock muffler "break in" like a new mufler since there is more flow?..the truck has 90k on it so i mean the exhaust has plenty miles im jsut wondering if with the cat out it will break in the muffler more since the less restricted flow and make it a little louder when im driving down the street.