Thrush turbo mufflers

Would you guys trust 16 year old thrush turbo mufflers for the break in? The ones on the car were relatively new when I parked it but it's been setting for 16 years idk what has got in it and built a home or died or something else in there. I'm just worried about them being blocked or something. I'm not worried so much about sound yet I just want a smooth uneventful breakin . I considered cutting them off and welding on some cheap glasspacks but dont really want to spend the money on a temporary muffler. Or I could just cut them off and weld a piece of pipe and straight pipe them. What do you guys think?