I don't know why but every time I turn my truck off in my driveway it always has little drop marks leading up to the muffler, then when I look at it it looks wet like this. I see a small hole but it never has done it this much

 

Do you make short trips? Short trips don't get the exhaust hot enough to evaporate all the condensation in the pipes. What remains will rust the exhaust, from the inside, out.

 

I drove like 2 minutes from work to my house

 

bingo