SpringtowN

So after my trAnny install i noticed that my motor seemed louder, it sounds almost like i have headers now, i thought that maybe i just needed to tighten up my cats but nope that not it, asked a muffler shop they said it probally a craked manifold,, i was like WTF no way i have held one of those things there solid, this possible?? anybody had this prob after dropping / installing tranny??
any help great??