ok now my friend bought it from my brother about 3 years ago last year he got a new muffler on it. its a high Performance muffler. now from what i understand they have to weld a muffler on to a car. well where the weld is it looks like they missed a spot and there is a small leak. what i want to know is, does that hole have 2 be there? or did they mess it up? also will patching that up make it quieter?