After years of pining I am looking to buy my first Impreza - a 2003 WRX with 105k miles. When trying to act like I knew what I was doing checking out the car's underside, I noticed what seem to me to be a "different" type of weld on the casing of the exhaust. Could anyone please enlighten me as to what I am actually looking at, and if there is a concern with the vehicle? Haze me, if you must. ;-) Thank you, Everyone!